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   1301360篇
  免费   96847篇
  国内免费   4183篇
耳鼻咽喉   18381篇
儿科学   42533篇
妇产科学   38097篇
基础医学   190487篇
口腔科学   35822篇
临床医学   111772篇
内科学   255406篇
皮肤病学   26733篇
神经病学   100511篇
特种医学   50950篇
外国民族医学   387篇
外科学   200302篇
综合类   30857篇
现状与发展   10篇
一般理论   304篇
预防医学   94105篇
眼科学   29733篇
药学   100495篇
  31篇
中国医学   3952篇
肿瘤学   71522篇
  2018年   12848篇
  2016年   10896篇
  2015年   12952篇
  2014年   17639篇
  2013年   25640篇
  2012年   35502篇
  2011年   38128篇
  2010年   22534篇
  2009年   21056篇
  2008年   36324篇
  2007年   39358篇
  2006年   39849篇
  2005年   39271篇
  2004年   37232篇
  2003年   36130篇
  2002年   35627篇
  2001年   58648篇
  2000年   60141篇
  1999年   51315篇
  1998年   14721篇
  1997年   13264篇
  1996年   13455篇
  1995年   12692篇
  1994年   12034篇
  1993年   11019篇
  1992年   41179篇
  1991年   40504篇
  1990年   40012篇
  1989年   38825篇
  1988年   36234篇
  1987年   35435篇
  1986年   33808篇
  1985年   32198篇
  1984年   23956篇
  1983年   20848篇
  1982年   12395篇
  1981年   10945篇
  1979年   22649篇
  1978年   15881篇
  1977年   13730篇
  1976年   12971篇
  1975年   14204篇
  1974年   16683篇
  1973年   16078篇
  1972年   15318篇
  1971年   14231篇
  1970年   13214篇
  1969年   12736篇
  1968年   11980篇
  1967年   10479篇
排序方式: 共有10000条查询结果,搜索用时 208 毫秒
101.
102.
103.
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   
104.
105.
106.
107.
108.
Background: Most theoretical models of self-determination suggest that both environmental and personal factors influence the development of self-determination. The design and implementation of interventions must be conducted with foreknowledge of such mediating and moderating factors if the intervention is to be successful.

Methods: The purpose of this study was to examine the degree to which several personal factors and school characteristics affect and explain students’ self-determination. A total of 232 students with intellectual disability from Spain participated. Their self-determination level was assessed by the ARC-INICO Scale.

Results: Students with moderate levels of intellectual disability obtained significantly lower scores on self-determination than their peers with mild intellectual disability. There were significant differences in relation to the level of support needs and their experience with transition programs. The level of support needs was a significant predictor.

Conclusion: These findings contribute to current research in this field and practical implications were discussed.  相似文献   

109.
International Journal of Clinical Pharmacy - Background Drug-related problems (DRP) following hospital discharge may cause morbidity, mortality and hospital re-admissions. It is unclear whether a...  相似文献   
110.
A pulmonary artery (PA) sling is a very rare congenital cardiovascular anomaly, and only a few studies have reported PA slings in fetuses. The relationship of the PA, aorta, ductus arteriosus, and trachea can be evaluated in the 3‐vessel and 3‐vessel and trachea views during fetal echocardiography. A PA sling can be detected by abnormal positioning of the left PA in relation to the trachea when sweeping from the 3‐vessel view cranially to the 3‐vessel and trachea view. Here we report 3 cases of fetal PA slings and their follow‐ups. Two cases were confirmed by postnatal echocardiography, and the other case was confirmed by a cardiovascular cast after pregnancy termination. We emphasize that the 3‐vessel and 3‐vessel and trachea views are of crucial importance in the prenatal diagnosis of a PA sling.  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