全文获取类型
收费全文 | 378816篇 |
免费 | 24831篇 |
国内免费 | 2804篇 |
专业分类
耳鼻咽喉 | 5185篇 |
儿科学 | 8233篇 |
妇产科学 | 10082篇 |
基础医学 | 53102篇 |
口腔科学 | 11778篇 |
临床医学 | 30148篇 |
内科学 | 78349篇 |
皮肤病学 | 8552篇 |
神经病学 | 27265篇 |
特种医学 | 13922篇 |
外国民族医学 | 82篇 |
外科学 | 60695篇 |
综合类 | 9954篇 |
现状与发展 | 1篇 |
一般理论 | 64篇 |
预防医学 | 17462篇 |
眼科学 | 9487篇 |
药学 | 30990篇 |
1篇 | |
中国医学 | 2193篇 |
肿瘤学 | 28906篇 |
出版年
2021年 | 2613篇 |
2019年 | 2724篇 |
2018年 | 4524篇 |
2017年 | 3434篇 |
2016年 | 3535篇 |
2015年 | 4024篇 |
2014年 | 5707篇 |
2013年 | 7380篇 |
2012年 | 10036篇 |
2011年 | 10216篇 |
2010年 | 6193篇 |
2009年 | 5846篇 |
2008年 | 9464篇 |
2007年 | 10298篇 |
2006年 | 10216篇 |
2005年 | 9297篇 |
2004年 | 8793篇 |
2003年 | 8550篇 |
2002年 | 8213篇 |
2001年 | 28295篇 |
2000年 | 28798篇 |
1999年 | 23677篇 |
1998年 | 5165篇 |
1997年 | 4251篇 |
1996年 | 3834篇 |
1995年 | 3486篇 |
1994年 | 3104篇 |
1993年 | 2841篇 |
1992年 | 16062篇 |
1991年 | 14817篇 |
1990年 | 14158篇 |
1989年 | 13963篇 |
1988年 | 12584篇 |
1987年 | 12062篇 |
1986年 | 11103篇 |
1985年 | 10330篇 |
1984年 | 6914篇 |
1983年 | 5602篇 |
1982年 | 2718篇 |
1979年 | 5479篇 |
1978年 | 3352篇 |
1977年 | 2979篇 |
1975年 | 2643篇 |
1974年 | 3066篇 |
1973年 | 2873篇 |
1972年 | 2830篇 |
1971年 | 2775篇 |
1970年 | 2511篇 |
1969年 | 2544篇 |
1968年 | 2252篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
31.
Y. Ermias I.A. Morgan K.M. Curtis M.K. Whiteman L.G. Horton L.B. Zapata 《Contraception》2019,99(5):300-305
ObjectiveIdentify factors associated with healthcare providers' frequency of depot medroxyprogesterone acetate (DMPA) provision to adolescents.Study designWe analyzed data from surveys mailed to a nationally representative sample of public-sector providers and office-based physicians (n=1984). We estimated adjusted odds ratios (aORs) and 95% confidence intervals (CIs) of factors associated with frequent DMPA provision to adolescents in the past year.ResultsAlthough most providers (>95%) considered DMPA safe for adolescents, fewer reported frequent provision (89% of public-sector providers; 64% of office-based physicians). Among public-sector providers, factors associated with lower odds of frequent provision included working in settings without Title X funding (aOR 0.44, 95% CI 0.30–0.64), reporting primary care as their primary clinical focus versus reproductive or adolescent health (aOR 0.42, 95% CI 0.28–0.61), and providing fewer patients with family planning services. Among office-based physicians, factors associated with lower odds of frequent provision included specializing in obstetrics/gynecology (aOR 0.50, 95% CI 0.27–0.91) and family medicine (aOR 0.21, 95% CI 0.09–0.47) versus adolescent medicine, completing training ≥15 versus <5 years ago (aOR 0.27, 95% CI 0.09–0.83), and reporting that 0–24% of patients pay with Medicaid or other government healthcare assistance versus ≥50% (aOR 0.23, 95% CI 0.09–0.61). The reason most commonly reported by providers for infrequent DMPA provision was patient preference for another method.ConclusionsWhile most providers reported frequently providing DMPA to adolescents, training on evidence-based recommendations for contraception, focused on subgroups of providers with lower odds of frequent DMPA provision, may increase adolescents' access to contraception.ImplicationsAlthough >95% of providers considered depot medroxyprogesterone (DMPA) a safe contraceptive for adolescents, only 89% of public-sector providers and 64% of office-based physicians reported frequently providing DMPA to adolescents. Provider training on evidence-based recommendations for contraception counseling and provision may increase adolescents' access to DMPA and all methods of contraception. 相似文献
32.
Prevention Science - This study aimed to evaluate the effectiveness of the drug and violence resistance educational program (PROERD) on short-term secondary outcomes, such as intentions to use... 相似文献
33.
34.
35.
36.
Parallel enzyme‐linked immunosorbent assay screening for human immunodeficiency virus among blood donors in five Chinese blood centres: a retrospective analysis
下载免费PDF全文
![点击此处可从《Transfusion medicine (Oxford, England)》网站下载免费的PDF全文](/ch/ext_images/free.gif)
37.
38.
39.
40.