首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   1052篇
  免费   54篇
  国内免费   9篇
耳鼻咽喉   6篇
儿科学   332篇
妇产科学   153篇
基础医学   44篇
口腔科学   9篇
临床医学   148篇
内科学   46篇
皮肤病学   9篇
神经病学   27篇
特种医学   3篇
外科学   26篇
综合类   46篇
预防医学   220篇
药学   22篇
中国医学   5篇
肿瘤学   19篇
  2023年   33篇
  2022年   53篇
  2021年   58篇
  2020年   37篇
  2019年   62篇
  2018年   54篇
  2017年   33篇
  2016年   42篇
  2015年   31篇
  2014年   63篇
  2013年   92篇
  2012年   59篇
  2011年   56篇
  2010年   50篇
  2009年   41篇
  2008年   41篇
  2007年   56篇
  2006年   41篇
  2005年   39篇
  2004年   28篇
  2003年   27篇
  2002年   20篇
  2001年   19篇
  2000年   19篇
  1999年   15篇
  1998年   8篇
  1997年   6篇
  1996年   8篇
  1995年   5篇
  1994年   1篇
  1993年   4篇
  1992年   1篇
  1991年   1篇
  1990年   1篇
  1989年   4篇
  1988年   1篇
  1986年   1篇
  1985年   2篇
  1984年   1篇
  1983年   1篇
  1981年   1篇
排序方式: 共有1115条查询结果,搜索用时 15 毫秒
1.
2.

Objective

This study assessed whether immediate postpartum insertion of levonorgestrel contraceptive implants is associated with a difference in infant growth from birth to 6 months, onset of lactogenesis, or breastfeeding continuation at 3 and 6 months postpartum compared to delayed insertion at 6 to 8 weeks postpartum.

Study design

We conducted a randomized trial of women in Uganda who desired contraceptive implants postpartum. We randomly assigned participants to receive either immediate (within 5 days of delivery) or delayed (6 to 8 weeks postpartum) insertion of a two-rod levonorgestrel contraceptive implant system. This is a prespecified secondary analysis evaluating breastfeeding outcomes. The primary outcome of this secondary analysis was change in infant weight; infants were weighed and measured at birth and 6 months. We used a validated questionnaire to assess onset of lactogenesis daily in person while participants were in the hospital, and then daily by phone after they left the hospital, until lactogenesis was documented. We used interviewer-administered questionnaires to assess breastfeeding continuation and concerns at 3 months and 6 months postpartum.

Results

Among the 96 women randomized to the immediate group and the 87 women to the delayed group, the mean change in infant weight from birth to 6 months was similar between groups: 4632?g in the immediate group and 4407?g in the delayed group (p=.26). Among the 97 women who had not experienced lactogenesis prior to randomization, the median time to onset of lactogenesis did not differ significantly between the immediate and delayed groups (65?h versus 63?h; p=.84). Similar proportions of women in the immediate and delayed groups reported exclusive breastfeeding at 3 months (74% versus 71%; p=.74) and 6 months (48% versus 52%; p=.58).

Conclusion

We found no association between the timing of postpartum initiation of levonorgestrel contraceptive implants and change in infant growth from birth to 6 months, onset of lactogenesis, or breastfeeding continuation at 3 or 6 months postpartum.

Implications

This study provides evidence that immediate postpartum initiation of contraception implants does not have a deleterious effect on infant growth or initiation or continuation of breastfeeding.  相似文献   
3.
4.
This paper compares experiences of breastfeeding outside the home for women living in low-income and high-income neighborhoods of the same city. Our findings are based on an analysis of 22 interviews with breastfeeding mothers (11 in each of two study areas) undertaken in Bristol, UK in 2017. We extend existing scholarship by showing how experiences of breastfeeding vary not only at the regional level but between local areas of the same city, and outline how our findings can inform policy. We advance literature on maternal bodies by exploring how local “landscapes” of breastfeeding emerge as mothers encounter and negotiate different socio-material landscapes and locally-differentiated norms about “appropriate” maternal embodiment. We argue that these variegated interactions can lead to different orientations to space and forms of spatial practice on the part of breastfeeding mothers, as well as different kinds of maternal identities.  相似文献   
5.
6.
7.
8.
SettingThis knowledge mobilization project was conceptualized to increase awareness among breastfeeding mothers and the general public on safe infant feeding practices during the COVID-19 pandemic by addressing myths and misconceptions associated with breastfeeding practices, guiding breastfeeding mothers to make informed decisions around child feeding practices, and offering meaningful guidance in simple language through a short online animated video.InterventionThis project was undertaken in four phases. During phase 1, an informal discussion was held with the breastfeeding mothers, service providers, and community partner in identifying issues surrounding lactation counselling facilities during the COVID-19 pandemic. During phase 2, recommendations from 23 organizations with regard to breastfeeding during COVID-19 were reviewed and analyzed. During phase 3, using evidence from reliable sources, a 5-minute animated e-resource on breastfeeding during COVID-19 was conceptualized and developed. During phase 4, the e-resource was disseminated to the breastfeeding mothers, general public, post-secondary institutions, and organizations providing services to breastfeeding mothers in Canada.OutcomesThis evidence-based e-resource facilitated addressing misconceptions around breastfeeding during COVID-19 and raising public awareness on safe infant feeding practices during this pandemic. Overall, the video was described as an informative, user-friendly, useful, and easily accessible resource by breastfeeding mothers who were in self-isolation with little access to healthcare services during the pandemic.ImplicationsThis project highlighted the importance of patient engagement and collaboration with the community partner in protecting breastfeeding during the COVID-19 pandemic. It further illustrated how informational e-resources can protect breastfeeding in situations where breastfeeding mothers’ access to healthcare services is compromised.  相似文献   
9.
目的 探讨北京市通州地区产妇泌乳启动延迟发生情况及相关影响因素,为提高母乳喂养率提供科学依据。方法 以2019年3月至2021年2月在北京市通州区妇幼保健院分娩的产妇为研究对象,由经过统一培训并考核合格的护理人员随访其泌乳情况并通过问卷收集孕妇相关资料。采用描述性分析方法对产妇泌乳延迟发生情况进行分析,并采用单、多因素分析方法对泌乳延迟发生影响因素进行分析。结果 共纳入2 109名产妇进行研究,产妇年龄20~48岁,以35~48岁居多,占54.10%。泌乳启动正常者1 387人,占65.8%,泌乳启动中位时间为50.65(19.33,70.14)h。泌乳启动延迟者722例,占34.2%。二分类Logistic回归分析结果显示,年龄≥35岁(OR=1.278)、孕期增重过多(OR=1.992)、初产妇(OR=1.243)、妊娠期糖尿病(OR=1.459)、妊娠期高血压疾病(OR=3.314)、剖宫产(OR=1.584)是产妇泌乳启动延迟发生的危险因素。结论 北京市通州区产妇泌乳启动延迟发生率较高,高龄、孕期增重过多、初产妇、妊娠期糖尿病、妊娠期高血压疾病、剖宫产均是产妇泌乳启动延迟发生的危险因素,医护人员应当对于上述类型产妇予以重视,及时关注治疗,以期改善产妇泌乳启动延迟情况。  相似文献   
10.
Objective: This study evaluates the effectiveness of a peer counseling program at increasing breastfeeding by participants in the Mississippi Special Supplemental Nutrition Program for Women, Infants and Children (WIC). Methods: Data from the 1989–1993 Pediatric Nutrition Surveillance System were analyzed to compare breastfeeding rates in clinics with and without peer counseling programs. A questionnaire completed by program staff to describe the program in greater detail helped identify characteristics associated with greater success. Results: The incidence of breastfeeding rose from 12.3% to 19.9% in those clinics with peer counseling programs, but only from 9.2% to 10.7% in clinics without a program. Clinics that started a program earlier showed greater changes in breastfeeding incidence. However, the presence of lactation specialists or consultants in the clinic appeared to be more important than the presence of less-trained peer counselors. Peer counselors who spent more than 45 minutes per participant were more effective than those spending less time. Conclusions: The peer counseling program significantly increased the incidence of breastfeeding, particularly in clinics with lactation specialists and consultants. Success can be enhanced by ensuring that peer counselors spend a great deal of time with the participants.  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号