全文获取类型
收费全文 | 651196篇 |
免费 | 46368篇 |
国内免费 | 17086篇 |
专业分类
耳鼻咽喉 | 6117篇 |
儿科学 | 19193篇 |
妇产科学 | 10736篇 |
基础医学 | 54987篇 |
口腔科学 | 12643篇 |
临床医学 | 71969篇 |
内科学 | 114708篇 |
皮肤病学 | 7668篇 |
神经病学 | 51088篇 |
特种医学 | 20330篇 |
外国民族医学 | 44篇 |
外科学 | 64566篇 |
综合类 | 94348篇 |
现状与发展 | 47篇 |
一般理论 | 44篇 |
预防医学 | 62581篇 |
眼科学 | 8311篇 |
药学 | 53632篇 |
642篇 | |
中国医学 | 40294篇 |
肿瘤学 | 20702篇 |
出版年
2023年 | 10568篇 |
2022年 | 16105篇 |
2021年 | 28031篇 |
2020年 | 26138篇 |
2019年 | 28598篇 |
2018年 | 26802篇 |
2017年 | 23898篇 |
2016年 | 21973篇 |
2015年 | 21255篇 |
2014年 | 41913篇 |
2013年 | 45309篇 |
2012年 | 36669篇 |
2011年 | 39763篇 |
2010年 | 31706篇 |
2009年 | 29829篇 |
2008年 | 29510篇 |
2007年 | 29681篇 |
2006年 | 26247篇 |
2005年 | 22367篇 |
2004年 | 18535篇 |
2003年 | 16010篇 |
2002年 | 13119篇 |
2001年 | 11741篇 |
2000年 | 9689篇 |
1999年 | 8368篇 |
1998年 | 7387篇 |
1997年 | 6862篇 |
1996年 | 5998篇 |
1995年 | 5642篇 |
1994年 | 5243篇 |
1993年 | 4315篇 |
1992年 | 4242篇 |
1991年 | 3720篇 |
1990年 | 3143篇 |
1989年 | 2768篇 |
1988年 | 2612篇 |
1987年 | 2247篇 |
1986年 | 2039篇 |
1985年 | 4947篇 |
1984年 | 5778篇 |
1983年 | 3929篇 |
1982年 | 4546篇 |
1981年 | 4138篇 |
1980年 | 3640篇 |
1979年 | 3335篇 |
1978年 | 2862篇 |
1977年 | 2202篇 |
1976年 | 2378篇 |
1975年 | 1795篇 |
1974年 | 1541篇 |
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
71.
72.
《Journal of the Academy of Nutrition and Dietetics》2022,122(12):2288-2294
BackgroundDental caries is the most common chronic childhood disease. Past studies revealed that grandparents provide their grandchildren with cariogenic foods and beverages (eg, those with free sugars and/or modified starches). Qualitative research can help identify what drives this phenomenon.ObjectiveOur aim was to examine mothers’ explanations for why grandparents in north central and central Appalachia give their grandchildren cariogenic foods and beverages.DesignA qualitative study on children’s oral health in Pennsylvania and West Virginia from 2018 through 2020 was performed. In-person, semi-structured interviews were conducted. Qualitative data from interviews were recorded, transcribed, and then coded using NVivo. Data analysis for this study was performed using thematic analysis with iterative theme development.Participants/settingThe participants were 126 mothers of children aged 3-5 years from West Virginia (n = 66) and Pittsburgh, PA (n = 60).Main outcome measuresMothers’ perspectives about why grandparents give their grandchildren cariogenic foods and beverages were analyzed.ResultsIn the study sample, 85% of mothers (n = 107/126) named at least 1 of their children’s grandparents as a member of their social network responsible for their children’s oral health. From these interviews, 85% of mothers (n = 91/107) discussed that grandparents gave their grandchildren cariogenic foods and beverages. The mothers described the following 4 themes to explain why grandparents gave their grandchildren cariogenic foods and beverages: privilege of the grandparent role; responsibilities of the grandparent role; symbol of care and affection; and limited consideration or understanding of the detrimental impact.ConclusionsGrandparents play a role in giving their grandchildren cariogenic foods and beverages, which could potentially contribute to childhood caries. Research is needed to develop effective social interventions to help some grandparents understand the implications of a cariogenic diet on their grandchildren’s oral health and/or decrease their provision of cariogenic foods and beverages. 相似文献
73.
《Vaccine》2022,40(18):2525-2527
74.
75.
目的探讨多元化联合教学模式在超声引导下疼痛介入治疗教学中的应用效果。方法选择2018年1月至2020年12月在北京大学第三医院疼痛科进修的30名医师作为研究对象,将其分为对照组与观察组;对照组采用常规教学模式;观察组采用多元化联合教学模式,比较两组医师技能考核成绩、教学质量评分和满意度评分。结果观察组医师技能考核成绩优良率为93.3%,高于对照组的73.3%(P<0.05);观察组医师对基础理论知识掌握、临床思维能力的提高、学习兴趣的激发、疾病诊治能力的提高4个方面的评分均高于对照组(P<0.01)。结论多元化联合教学模式可促进超声引导下疼痛介入治疗技能的提高,有利于提高学员的综合临床能力。 相似文献
76.
IntroductionThis study was designed to assess whether a dental caries management protocol combining a single application of 38% silver diamine fluoride (SDF) with comprehensive oral health education will successfully divert high-risk children from dental treatment under dental general anaesthesia (DGA), arrest active caries in primary teeth, and improve parent-reported child oral health–related quality of life (OHRQoL).MethodsChildren aged 2 to 10 years, who attended two public dental agencies in Victoria, Australia, and were unable to tolerate restorative treatments in the clinic setting, elected to participate in either a 38% SDF intervention protocol or, alternatively, referral for DGA. Follow-up examinations were completed at 6 months to assess caries progression, decayed missing filled tooth index, PUFA index (pulpal involvement, ulceration, fistula, abscess), DGA referral rates, and OHRQoL (Early Childhood Oral Health Impact Scale [ECOHIS]).ResultsOf the total sample, 89.5% of children (n = 102) [mean (SD) age, 4.1 (1.0) years] with 401 active carious lesions elected to participate in the 38% SDF protocol; 10.5% (n = 12) of parents opted for referral for treatment under DGA. The proportion of active caries subsequently arrested at follow-up (number of arrested lesions/number of lesions treated) was 0.78 (95% CI, 0.69 to 0.87). There was an 88% reduction in referrals for DGA in eligible children over the 6-month period. The 38% SDF intervention group showed a significant improvement in ECOHIS scores at follow-up (P < .001).DiscussionAdoption of the 38% SDF intervention protocol resulted in a significant reduction in the rate of preventable dental hospitalisations. Most parents opted against referral for DGA. Parent-reported OHRQoL for children improved significantly. 相似文献
77.
《Journal of vascular and interventional radiology : JVIR》2022,33(4):399-407
PurposeTo evaluate the midterm outcomes of percutaneous transluminal renal angioplasty (PTRA) for pediatric renovascular hypertension (RVH).Materials and MethodsThe clinical data of patients who underwent PTRA for RVH in the authors’ hospital from 2012 to 2019 were retrospectively analyzed. Postprocedural blood pressure, glomerular filtration rate (GFR) of the affected kidney, restenosis, and complications were closely monitored.ResultsPTRA was performed in a total of 30 children (20 boys and 10 girls), with a mean age of 7.3 years ± 0.7 (range, 40 days to 13.9 years) and a mean weight of 25.0 kg ± 2.3 (range, 3.4–53 kg). The median follow-up period was 26.5 months (range, 1 month to 7.5 years). Technical success was achieved in 26 (86.7%) of the 30 patients. Restenosis developed in 3 patients (10.0%). Only 1 patient underwent stent implantation, and the stent fractured 8 months later, requiring further intervention. There were no other complications. In terms of clinical benefit of blood pressure control after the initial PTRA procedure, 15 patients (50%) were cured and 7 patients (23.3%) showed improvement. There was no significant difference in the etiology, lesion location, and lesion length between patients with clinical benefit and failure (P = .06, P = .202, and P = .06, respectively). GFR of the affected kidney was significantly improved from 19.9 mL/min ± 11.2 to 38.1 mL/min ± 11.9 at the 6-month follow-up after PTRA (P < .001).ConclusionsThe overall results of PTRA for pediatric RVH caused by different etiologies are promising. PTRA not only provided a clinical benefit of blood pressure control in 73.3% of the patients but also significantly improved the function of the affected kidney. 相似文献
78.
79.
80.