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   22403篇
  免费   1544篇
  国内免费   107篇
耳鼻咽喉   234篇
儿科学   561篇
妇产科学   443篇
基础医学   3505篇
口腔科学   546篇
临床医学   2176篇
内科学   5172篇
皮肤病学   542篇
神经病学   2547篇
特种医学   644篇
外科学   2038篇
综合类   131篇
一般理论   14篇
预防医学   1867篇
眼科学   473篇
药学   1385篇
中国医学   78篇
肿瘤学   1698篇
  2024年   27篇
  2023年   199篇
  2022年   387篇
  2021年   775篇
  2020年   496篇
  2019年   692篇
  2018年   753篇
  2017年   562篇
  2016年   672篇
  2015年   788篇
  2014年   956篇
  2013年   1179篇
  2012年   1889篇
  2011年   2021篇
  2010年   1074篇
  2009年   952篇
  2008年   1560篇
  2007年   1572篇
  2006年   1454篇
  2005年   1379篇
  2004年   1264篇
  2003年   1139篇
  2002年   972篇
  2001年   115篇
  2000年   78篇
  1999年   122篇
  1998年   188篇
  1997年   159篇
  1996年   113篇
  1995年   87篇
  1994年   69篇
  1993年   49篇
  1992年   36篇
  1991年   28篇
  1990年   34篇
  1989年   23篇
  1988年   17篇
  1987年   18篇
  1986年   8篇
  1985年   11篇
  1984年   12篇
  1983年   16篇
  1982年   12篇
  1981年   10篇
  1980年   17篇
  1979年   10篇
  1978年   7篇
  1977年   8篇
  1975年   6篇
  1973年   9篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
Die Anaesthesiologie - Die Anlage einer Magensonde im OP oder auf einer Intensivstation (ITS) stellt eine alltäglich durchgeführte Prozedur dar. Obwohl die Sonde häufig durch...  相似文献   
2.
3.
4.
5.

Introduction

Little is known about dementia incidence in diverse populations of oldest-old, the age group with highest dementia incidence.

Methods

Incident dementia diagnoses from 1/1/2010 to 9/30/2015 were abstracted from medical records for 2350 members of an integrated health care system in California (n = 1702 whites, n = 375 blacks, n = 105 Latinos, n = 168 Asians) aged ≥90 in 2010. We estimated race/ethnicity-specific age-adjusted dementia incidence rates and implemented Cox proportional hazards models and Fine and Gray competing risk of death models adjusted for demographics and comorbidities in midlife and late-life.

Results

Dementia incidence rates (n = 771 cases) were lowest among Asians (89.9/1000 person-years), followed by whites (96.9/1000 person-years), Latinos (105.8/1000 person-years), and blacks (121.5/1000 person-years). Cox regression and competing risk models estimated 28% and 36% higher dementia risk for blacks versus whites adjusting for demographics and comorbidities.

Discussion

Patterns of racial/ethnic disparities in dementia seen in younger older adults continue after the age of 90 years, though smaller in magnitude.  相似文献   
6.
7.
8.
9.

Background

Physicians treating nonvalvular atrial fibrillation (AF) assess stroke and bleeding risks when deciding on anticoagulation. The agreement between empirical and physician-estimated risks is unclear. Furthermore, the association between patient and physician sex and anticoagulation decision-making is uncertain.

Methods

We pooled data from 2 national primary care physician chart audit databases of patients with AF (Facilitating Review and Education to Optimize Stroke Prevention in Atrial Fibrillation and Coordinated National Network to Engage Physicians in the Care and Treatment of Patients with Atrial Fibrillation Chart Audit) with a combined 1035 physicians (133 female, 902 male) and 10,927 patients (4567 female and 6360 male).

Results

Male physicians underestimated stroke risk in female patients and overestimated risk in male patients. Female physicians estimated stroke risk well in female patients but underestimated the risk in male patients. Risk of bleeding was underestimated in all. Despite differences in risk assessment by physician and patient sex, > 90% of patients received anticoagulation across all subgroups. There was modest agreement between physician estimated and calculated (ie, CHADS2 score) stroke risk: Kappa scores were 0.41 (0.35-0.47) for female physicians and 0.34 (0.32-0.36) for male physicians.

Conclusions

Our study is the first to examine the association between patient and physician sex influences and stroke and bleeding risk estimation in AF. Although there were differences in agreement between physician estimated stroke risk and calculated CHADS2 scores, these differences were small and unlikely to affect clinical practice; further, despite any perceived differences in the accuracy of risk assessment by sex, most patients received anticoagulation.  相似文献   
10.
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