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1.
目的分析脑性瘫痪(简称脑瘫)患儿维生素D的营养状况。方法 2015年4月至2015年6月沈阳市儿童医院康复科收治住院的脑瘫患儿113例为观察组,选择同期在本院健康体检的儿童150例为对照组。采用高效液相色谱-串联质谱法对脑瘫患儿和体检儿童血清中25羟基维生素D[25(OH)D]水平进行检测,比较两组儿童25(OH)D水平的差异。结果观察组总体血清25(OH)D水平为(20.7±6.0)μg/L,明显低于对照组(25.3±7.5)μg/L,差异有统计学意义(P0.01);各年龄段观察组25(OH)D水平均低于同年龄对照组,差异有统计学意义(P0.05)。观察组1~3岁和3~6岁25(OH)D不足和缺乏发生率高于对照组,差异有统计学意义(P0.05),6~12岁两组25(OH)D不足和缺乏发生率比较差异无统计学意义(P0.05)。结论脑瘫患儿血清25(OH)D水平明显低于健康儿童,在对脑瘫患儿进行常规康复训练的同时应关注维生素D水平,从而有利于患儿获得更好的康复效果。  相似文献   

2.
目的检测婴幼儿常见喘息性疾病及同龄健康儿童血清维生素A水平,探讨维生素A水平与常见喘息性疾病的关系,为支气管哮喘的早期识别和预防提供新思路。方法选取2017年3月至2018年3月在我院诊断为婴幼儿喘息性疾病患儿100例为观察组,并收集与观察组在年龄、性别、就诊时间上匹配的健康体检儿童100例作为对照组,测定所有受试者的血清维生素A,比较喘息性疾病患儿与正常儿童的血清维生素A的差异;对于维生素A缺乏的患儿给予基础治疗基础上,给予维生素A制剂治疗,维生素A达到正常后停止药物治疗,随访3、6、12个月,比较血清维生素A水平及喘息发作次数;比较维生素A正常与缺乏患儿喘息发作次数的差异。结果观察组100例患儿中维生素A缺乏68例,血清维生素A正常32例;对照组100例健康幼儿维生素A缺乏21例,血清维生素A正常79例;两组比较差异有统计学意义(P0.05)。观察组患儿0~1岁和1~3岁维生素A水平显著低于同年龄段对照组儿童,差异有统计学意义(P0.05)。随访3、6、12个月时血清维生素A的水平与喘息性疾病患儿的喘息发作次数之间存在负相关(P0.05)。随访3、6、12个月时,喘息性疾病患儿维生素A正常与缺乏喘息次数比较差异均有统计学意义(P0.05)。结论喘息性疾病患儿的血清维生素A水平低于健康体检幼儿;血清维生素A水平与喘息次数具有负相关性,血清维生素A水平越低,喘息性疾病患儿的喘息发作次数越多;喘息性疾病患儿合并维生素A缺乏的患儿血清维生素A纠正后,喘息发作次数减少。  相似文献   

3.
目的分析肺炎支原体肺炎患儿血清维生素A与维生素E水平,探讨维生素A与维生素E水平变化与儿童肺炎支原体肺炎之间的关系。方法选取2018年1月至12月抚矿总医院收治的肺炎支原体肺炎患儿90例为观察组,同期选取我院儿科保健门诊进行体检的健康儿童90例作为对照组。比较两组患儿血清维生素A与维生素E水平。结果观察组患儿血清维生素A水平显著低于对照组,差异有统计学意义(P0.05)。两组血清维生素E水平比较差异无统计学意义(P0.05)。观察组可疑亚临床维生素A缺乏的检出率38.89%,亚临床维生素A缺乏的检出率34.44%,均显著高于对照组,差异有统计学意义(P0.05)。结论肺炎支原体肺炎患儿普遍存在亚临床及可疑亚临床维生素A缺乏情况。维生素A缺乏与肺炎支原体肺炎可能存在一定的相关性。  相似文献   

4.
目的了解沈阳市0~6岁体检儿童维生素A(VitA)水平现状。方法以2015年2月至2016年2月在沈阳市儿童医院儿保门诊健康体检的0~6岁儿童为研究对象,按年龄分为0~1岁组、1~3岁组、3~6岁组,共1 490名,采用高效液相色谱法检测血清VitA水平。结果 0~6岁体检儿童血清VitA平均水平为(1.10±0.26)μmol/L,亚临床维生素A缺乏(SVAD)发生率是4.0%,可疑SVAD发生率是36.6%。0~1岁组儿童血清VitA水平低于1~3岁组和3~6岁组儿童,差异有统计学意义(P0.05)。1~3岁组和3~6岁组儿童血清VitA水平差异无统计学意义(P0.05)。各年龄组间SVAD和可疑SVAD发生率比较,差异无统计学意义(P0.05)。1个月内患腹泻、呼吸系统感染患儿SVAD发生率高于健康儿童(P0.01)。结论目前沈阳市学龄前儿童无临床表现的SVAD及可疑SVAD的发病率仍较高,应提高全社会对VitA的认识,积极预防和干预这一年龄阶段儿童尤其是婴幼儿维生素A缺乏症的发生,从而减少呼吸系统和消化系统疾病的发生。  相似文献   

5.
目的了解沈阳地区儿童血清维生素A水平及缺乏情况。方法选取2015年1月至2016年2月沈阳市儿童医院儿保科正常体检儿童(年龄0~14岁)1 636例,按性别和年龄分组分析沈阳地区儿童维生素A水平并评价缺乏状况。结果不同年龄组儿童不同性别间维生素A均值比较差异无统计学意义(P0.05),而且是随年龄增长而增加。每个年龄组中血清维生素A真正缺乏的比例很小,但边缘缺乏的比例却不容忽视。结论沈阳地区儿童维生素边缘缺乏情况较常见,倡导儿童均衡营养,定期监测。  相似文献   

6.
目的探讨喘息性肺炎患儿血清碱性磷酸酶、25-(OH)D3及IgA水平的变化及临床疗效。方法将80例喘息性肺炎患儿随机分为维生素D治疗组及非维生素D治疗组,均给予抗感染及对症治疗,同时维生素D治疗组给予补充维生素D治疗1个月,治疗前及治疗后1个月分别检测血清碱性磷酸酶、25-(OH)D3及IgA水平,同时记录患儿临床疗效。结果 (1)治疗1个月后,喘息性肺炎维生素D治疗组碱性磷酸酶、25-(OH)D3及IgA水平均优于治疗前,差异有统计学意义(P〈0.05)。(2)维生素D治疗组气促喘息消失时间、心率恢复正常时间、哮鸣音消失时间、住院时间较非维生素D治疗组明显降低,差异有统计学意义(P〈0.05)。(3)维生素D治疗组总有效率97.5%(39/40),明显高于非维生素D治疗组75.0%(30/40),差异有统计学意义(P〈0.01)。结论辅以足量的维生素D可缩短喘息性肺炎病程,改善疗效,提高患儿免疫力,维生素D缺乏可能为喘息性肺炎潜在病因。  相似文献   

7.
目的总结维生素A联合铁锌口服液预防儿童反复呼吸道感染的应用价值。方法选取反复呼吸道感染患儿120例,依据随机分配原则分为对照组和观察组,对照组给予常规对症支持治疗,观察组在此基础上给予维生素A联合铁锌口服液治疗,统计分析所有患儿血清免疫球蛋白IgA、IgG、IgM水平和平均治愈时间、感染次数、持续时间。结果观察组血清IgA、IgG、IgM水平明显高于对照组,差异有统计学意义(P0.05);观察组平均治愈时间、感染次数、持续时间明显低于对照组,差异有统计学意义(P0.05)。结论维生素A联合铁锌口服液可有效提高反复呼吸道感染患儿的治疗效果,具有提高免疫力、抵抗力的作用。  相似文献   

8.
目的了解鄂尔多斯地区儿童维生素D营养状态,为临床合理补充维生素D提供依据。方法选取2016年8月至2018年8月鄂尔多斯市中心医院门诊体检的1 572例居住在鄂尔多斯地区的29 d至18岁健康儿童为研究对象,采用电化学发光法检测25-羟维生素D[25-(OH)D]水平。结果 1 572例研究对象中维生素D缺乏779例(49.56%),维生素D不足576例(36.64%),维生素D充足217例(13.80%)。随年龄增长维生素D缺乏和不足更明显,9个月以前随着月龄增长维生素D水平增加,9~12个月时达峰值,1~18岁随着年龄的增长,维生素D水平不断下降。男孩与女孩25-(OH)D水平及维生素D缺乏率、不足率比较,差异均无统计学意义(P0.05)。秋季血清25-(OH)D水平最高,冬季最低,二者比较差异有统计学意义(P0.05);其余各季节间比较差异无统计学意义(P0.05)。结论鄂尔多斯地区的29 d至18岁健康儿童25-(OH)D水平较低,维生素D不足和缺乏普遍存在。  相似文献   

9.
目的:观察不同维生素D(Vitamin D)状态下妊娠早期桥本甲状腺炎(HT)患者血清中促甲状腺激素(TSH)、甲状腺过氧化物酶(TPOAb)以及转化生长因子β1(TGF-β1)水平变化,旨在初步探讨它们与维生素D之间的关系,以及它们在妊娠早期HT过程中的可能作用。方法:选取2018年4月27日至2019年7月12日遵义医科大学附属医院内分泌科及妇产科门诊妊娠早期HT妇女100例,按血清25(OH)D浓度分为3组:HT+维生素D正常组(A组20例);HT+维生素D不足组(B组35例);HT+维生素D缺乏组(C组45例)。同期筛选我院未患HT的妊娠早期人群作为对照组(100例),按血清中25(OH)D浓度分为3组:维生素D正常组(D组25例)、维生素D不足组(E组35例)、维生素D缺乏组(F组40例)。采用酶联免疫吸附(ELISA)法测定所有对象血清中TGF-β1水平。结果:(1)A、B、C三组相比较,FT_4、25(OH)D逐渐降低,TSH、TPOAb、TGF-β1逐渐升高,差异有统计学意义(P0.05);TgAb、FT_3差异无统计学意义(P0.05);(2)D、E、F三组相比较,25(OH)D逐渐降低,TGF-β1逐渐升高,差异有统计学意义(P0.05);TSH、TPOAb、TgAb、FT3、FT4差异无统计学意义(P0.05);(3)A组与D组相比较,TSH、TPOAb、TgAb明显升高,FT3、FT4明显降低,差异有统计学意义(P0.05),TGF-β1、25(OH)D差异无统计学意义(P0.05)。Pearson结果显示,血清中TGF-β1水平与TSH、TPOAb呈正相关,与FT_4、25(OH)D呈负相关。Logistic回归分析结果显示,TGF-β1、TSH、TPOAb是妊娠早期人群合并HT的独立危险因素,FT_4、25(OH)D为保护因素。结论:维生素D缺乏可能引起血清中TGF-β1水平升高,两者可能共同参与妊娠早期HT的发生发展。  相似文献   

10.
目的评价维生素A联合铁剂治疗学龄前儿童缺铁性贫血的临床疗效。方法选择2014年12月至2016年12月漯河市第二人民医院收治的缺铁性贫血患儿92例,随机分为观察组和对照组各46例。对照组患儿给予琥珀酸亚铁片,5 mg/(kg·d),分3次口服,连续服用30 d为1个疗程。观察组在对照组治疗基础上给予维生素A胶丸,每次2.5万U,每日1次,连服7 d,停药3 d后再服7 d,30 d内按此服用。比较两组临床疗效及治疗前后血红蛋白、血清铁蛋白含量、血清铁含量及总铁结合力。结果观察组临床总有效率为100.0%(46/46),显著高于对照组80.4%(37/46),差异有统计学意义(P0.05)。观察组患儿经1个疗程治疗后血红蛋白、血清铁蛋白含量、血清铁含量及总铁结合力均高于对照组,差异有统计学意义(P0.05)。结论维生素A联合铁剂治疗学龄前儿童缺铁性贫血效果显著,且疗效较单用铁剂治疗明显。  相似文献   

11.
目的探讨血清维生素D水平与卵巢储备标志物抗苗勒管激素(anti-Müllerian hormone,AMH)和窦卵泡数(antral follicle count,AFC)之间的关系。方法回顾性分析2016年5月—2017年6月第一次接受辅助生殖助孕技术治疗的不孕症患者共2 391例,根据患者血清25(OH)D_3水平分为≤30 nmol/L组(A组,n=417)、30.1~49.9 nmol/L组(B组,n=626)和≥50 nmol/L组(C组,n=1 348)。分析患者血清25(OH)D_3水平与不孕女性卵巢储备标志物血清AMH水平和AFC之间的相关性。结果 (1)各组患者间的年龄、体质量指数(BMI)、基础FSH、不孕原因构成比及不同季节的维生素D水平的差异均无统计学意义(P0.05);(2)3组患者的AMH水平分别为(4.07±3.53)ng/mL、(4.12±3.43)ng/mL和(4.10±3.18)ng/mL;AFC分别为14.0±6.7、13.7±5.9和14.1±6.1,组间差异均无统计学意义(P0.05);(3)调整潜在的混杂因素后,运用相关因素多重线性回归分析显示,血清AMH水平的偏回归系数(B)=-0.005,标准误差(sx)=0.007,P=0.506;AFC的B=-0.122,sx=0.019,P=0.214,与血清25(OH)D_3水平之间均无相关性(P0.05)。结论不孕女性维生素D和卵巢储备标志物血清AMH水平及AFC之间不存在相关性,对维生素D缺乏的不孕女性通过补充维生素D以改善卵巢储备功能可能没有作用。  相似文献   

12.
目的探讨同型半胱氨酸(Hcys)、叶酸、维生素B12与妊娠高血压综合征(妊高征)发病的关系. 方法采用荧光偏振免疫分析法检测59例妊高征患者(妊高征组)和60例正常晚期妊娠妇女(对照组)血清中Hcys水平;并同时用微粒子酶联免疫分析法检测两组孕妇血清中叶酸、维生素B12水平. 结果 (1)妊高征组孕妇血清Hcys水平为(13.1±3.7) μmol/L,对照组孕妇为(10.4±3.9) μmol/L, 两组比较,差异有显著性( P <0.05).(2)妊高征组孕妇血清叶酸、维生素B12水平分别为(12.9±4.0) μmol/L及(339.5±115.6) μmol/L; 对照组孕妇叶酸、维生素B12水平分别为(13.7±2.5) μmol/L及(350.1±153.0) μmol/L.两组比较,差异无显著性( P >0.05). 结论 Hcys代谢异常在妊高征发病中起重要作用,叶酸、维生素B12水平与妊高征发病无直接关系.  相似文献   

13.

Introduction

Metabolic disturbances are common in women with PCOS. Some studies have suggested that vitamin D deficiency may play a role in metabolic disorders and insulin resistance, although limited clinical trials on this subject have been published with contradictory findings. Therefore, the aim of this study was to investigate the effects of vitamin D on metabolic disorders in women with PCOS and vitamin D deficiency.

Methods

This study was a randomized-blinded clinical trial. Eighty-six women diagnosed with PCOS and vitamin D deficiency aged between 18 and 45 were enrolled. They were randomly divided into two groups of interventional (44 women) and control (42 women). In each group, patient assignment was done using randomized blocks of four. Based on the block combination, vitamin D at a dose of 50,000 unit per week (Interventional group) and a dose of 50,000 units per month (Control group) and elemental calcium at a dose of 1000?mg per day were administered by a nurse. Metabolic parameters (i.e., LDL, HDL, total cholesterol, HOMA-IR, serum insulin, FBS, TG) and serum vitamin D were measured at baseline and 2?months after treatment.

Results

In vitamin D group, serum levels of 25 (OH) D increased. There was no significant difference in the metabolic parameters before and after treatment in each group (P?>?.05). At the end of the study, the metabolic parameters and HOMA-IR did not show a significant difference.

Conclusion

This study showed that vitamin D replacement in women with PCOS and vitamin D deficiency has no effect on the improvement of metabolic parameters and HOMA-IR.  相似文献   

14.

Objective

This study aims to investigate the possible role of vitamin D deficiency in primary dysmenorrhea by assessing serum 25-hydroxyvitamin D3 levels in a cohort which includes young Turkish women with primary dysmenorrhea and healthy controls.

Materials and methods

A total of 683 women who were aged between 18 and 25 years and who were consecutively admitted to the study center were eligible. After the exclusion of 55 women, 184 women with primary dysmenorrhea were randomly assigned into the dysmenorrhea group and 184 women without dysmenorrhea were randomly allocated into the control group.

Results

The dysmenorrhea group had significantly less consumption of dairy products (p = 0.001), lower serum calcium (p = 0.001), lower serum vitamin D (p = 0.001) and higher serum parathyroid hormone (p = 0.001) than those of the control group. Hyperparathyroidism was significantly less frequent whereas vitamin D deficiency was significantly more frequent in the dysmenorrhea group (p = 0.001 for each). The dysmenorrhea patients with vitamin D deficiency had significantly higher visual analogue scale (VAS) scores (p = 0.001). Depression, irritability, mood swings, fatigue, headache and breast tenderness were significantly more frequent in the vitamin D deficiency group (p < 0.05 for all). The VAS scores of the dysmenorrhea patients correlated positively and significantly with serum parathyroid hormone levels (r = 0.666, p = 0.001) whereas these VAS scores correlated negatively and significantly with serum vitamin D levels (r = ?0.713, p = 0.001).

Discussion

The significant and positive correlation between vitamin D levels and VAS scores and the significant reduction in serum vitamin D levels of the dysmenorrhea patients designate the possible role of vitamin D deficiency in the primary dysmenorrhea.  相似文献   

15.
目的 探讨我国神经管畸形(neural tube defects,NTD)高发地区孕妇血清叶酸、维生素B12(vitamin B12,VitB12)水平与子代NTD的关系.方法 采用病例对照研究设计,以NTD高发的山西省5个县作为研究现场.病例组为经B超诊断胎儿合并NTD并通过终止妊娠确诊的孕妇以及分娩NTD的孕妇,对照组为B超诊断胎儿发育正常的孕早、中和晚期孕妇.比较两组血清叶酸和VitB12水平(以几何均数及第5~95百分位数表示)的差异.分别以对照组血清叶酸和VitB12浓度的第10百分位作为界值,划分为2个水平组,分析低浓度水平组NTD的发病风险.结果 病例组和对照组血清VitB12浓度分别为83.8 pmol/L(30.5~209.1)pmol/L、102.6 pmol/L(51.9~269.7)pmol/L,差异具有统计学意义(P<0.05);两组孕妇血清叶酸浓度分别为10.5 pmol/L(4.4~24.5)nmol/L、12.9 pmol/L(6.3~32.7)nmol/L,差异具有统计学意义(P<0.05).子代合并脊柱裂的孕妇血清叶酸、VitB12浓度均低于对照组(P分别=0.017和0.001),子代合并无脑儿的孕妇仅血清叶酸浓度低于对照组(P=0.011),而子代合并脑膨出的孕妇血清叶酸、VitB12浓度与对照组相比差异均无统计学意义(P均>0.05).低VitB12水平孕妇发生NTD的校正危险度为正常水平者的2.58倍(95%CI:1.20~5.51),低叶酸水平孕妇发生NTD的校正危险度是正常叶酸水平孕妇的2.76倍(95%CI:1.30~5.87).结论 低水平血清叶酸和/或VitB12可能是本研究人群NTD发生的危险因素.  相似文献   

16.
目的:比较超重肥胖和非肥胖妊娠期糖尿病(GDM)孕妇及新生儿脐血血清维生素D水平,探讨可能影响因素。方法:选取2015年1月—2017年4月南京医科大学附属常州妇幼保健院住院足月分娩的孕妇为研究对象,分为糖耐量正常组(NGT)70例和GDM组70例,依据体质量指数(BMI)再将其分为NGT不伴肥胖组(N1组)、NGT伴超重肥胖组(N2组)、GDM不伴肥胖组(G1组)、GDM伴超重肥胖组(G2组),各35例,检测母亲外周血和新生儿脐血血清25羟维生素D水平,同时检测空腹血糖(FBG)、空腹胰岛素(FINS)水平,并计算稳态模型胰岛素抵抗指数(HOMA-IR)。结果:4组孕妇的年龄、孕次、产次、孕周、钙剂和维生素D补充及平均日晒时间比较,差异均无统计学意义(均P>0.05)。母血维生素D水平GDM孕妇低于NGT孕妇(G1组低于N1组,G2组低于N2组),超重肥胖孕妇低于非肥胖孕妇(N2组低于N1组,G2组低于G1组),GDM伴超重肥胖孕妇最低,差异均有统计学意义(P<0.05);新生儿脐血维生素D水平GDM组低于NGT组(G1组低于N1组,G2组低于N2组),NGT组超重肥胖孕妇低于非肥胖孕妇(N2组低于N1组),差异均有统计学意义(P<0.05)。孕妇维生素D水平与FBG、孕前BMI呈负相关,与孕期维生素D补充、日晒时间呈正相关,脐血维生素D水平与母血维生素D水平呈正相关(均P<0.05)。结论:GDM孕妇普遍维生素D水平低,GDM伴超重肥胖孕妇更明显,新生儿脐血维生素D水平受母血影响,母血维生素D水平受FBG、孕前BMI、孕期维生素D摄入与日晒时间影响。  相似文献   

17.
We aimed to evaluate the relationship between serum 25-hydroxy vitamin D levels and the risk of uterine fibroids in premenopausal women in Turkish population in this prospective observational cross-sectional study. Sixty-eight women with at least one uterine leiomyoma ≥10?mm were compared with 56 healthy controls. Serum 25-(OH) vitamin D3 levels were measured by electrochemiluminescence immunoassay. The groups were similar in terms of age, BMI, gravidity and parity numbers. The mean level of 25-(OH) D3 were 7.28?±?4.94?ng/ml and 78% of patients (n?=?97) had severe vitamin D deficiency (?p?=?.009). Vitamin D levels were not correlated with size, volume, localization and number of leiomyomas. Traditional covered clothing style, low education level and being housewife were risk factors for Vitamin D deficiency. This is the first study that investigates the vitamin D levels in women with leiomyomas in Turkish population. Influence of vitamin D on uterine leiomyoma formation to may lead to new preventive strategies in the future.  相似文献   

18.

Objective

To assess the correlation between the levels of vitamin D in follicular fluid and serum, and to determine whether the level of 25-hydroxyvitamin D (25OH-D) in follicular fluid of infertile women undergoing assisted reproductive technology (ART) is associated with the outcome.

Study design

Eighty-two infertile women undergoing ART at an academic tertiary care centre were recruited for a prospective cohort study. Levels of 25OH-D in follicular fluid and serum were measured. Standardized regimens for pituitary downregulation and controlled ovarian hyperstimulation were employed. Patient and cycle parameters, and clinical pregnancy (defined as evidence of intra-uterine gestation sac plus heart rate on ultrasound) were determined.

Results

A significant correlation was found between the levels of vitamin D in follicular fluid and serum (r = 0.767, p = 0.001). The overall rates of chemical, clinical and ongoing pregnancy were 35.5% (n = 29), 29.3% (n = 24) and 23.2% (n = 19), respectively. No significant difference was found in these pregnancy rates between the tertiles of 25OH-D level in follicular fluid (p = 0.959, 0.995 and 0.604, respectively). The median serum level of vitamin D was 8.13 (range 5.37-13.62) ng/ml in the clinically pregnant group and 8.29 (range 5.93-21.23) ng/ml in the non-pregnant group (p = 0.235). Interestingly, the median level of vitamin D in follicular fluid was 9.19 (range 5.25-19.51) ng/ml in the clinically pregnant group and 10.34 (range 5.89-29.69) ng/ml in the non-pregnant group (p = 0.433). The fertilization rate decreased significantly and the implantation rate increased (not significantly) with increasing tertiles of 25OH-D level in follicular fluid.

Conclusions

The level of 25OH-D in follicular fluid is reflective of body stores of vitamin D. Most subjects in this study were deficient in vitamin D, but this study found that vitamin D deficiency does not play a pivotal role in the outcome of ART.  相似文献   

19.
Objective: We wanted to define levels of vitamin D (25(OH)D), parathormone (PTH), calcium (Ca), phosphorus (P) and the correlations between them during gestation as well as in umbilical cord blood.

Methods: The study included 37 healthy singleton pregnant women in the course of gestation with no medical history concerning systemic diseases, nor with negative obstetrics and gynecological history. Biochemical parameters were determined using commercially available kits.

Results: In the studied group, there were no significant differences in serum vitamin D, PTH, Ca and P concentrations in each trimester and during delivery. The negative significant association between serum 25(OH)D and PTH level was observed (r=?0.25; pppr=?0.74; p?Conclusion: The study showed that regardless of the supplementation only 11–21% of studied pregnant women had optimal levels of vitamin D. The association between maternal and cord blood 25(OH)D suggested that inadequate vitamin D stores- during pregnancy may lead to a deficiency of this vitamin in newborns.  相似文献   

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