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   17356篇
  免费   1316篇
  国内免费   39篇
耳鼻咽喉   160篇
儿科学   634篇
妇产科学   499篇
基础医学   2335篇
口腔科学   208篇
临床医学   2577篇
内科学   2983篇
皮肤病学   188篇
神经病学   1944篇
特种医学   400篇
外科学   1315篇
综合类   234篇
一般理论   37篇
预防医学   2565篇
眼科学   347篇
药学   977篇
中国医学   7篇
肿瘤学   1301篇
  2023年   128篇
  2022年   181篇
  2021年   379篇
  2020年   227篇
  2019年   355篇
  2018年   421篇
  2017年   315篇
  2016年   338篇
  2015年   416篇
  2014年   557篇
  2013年   869篇
  2012年   1174篇
  2011年   1260篇
  2010年   689篇
  2009年   576篇
  2008年   1107篇
  2007年   1173篇
  2006年   1205篇
  2005年   1147篇
  2004年   1021篇
  2003年   972篇
  2002年   986篇
  2001年   143篇
  2000年   120篇
  1999年   144篇
  1998年   209篇
  1997年   157篇
  1996年   136篇
  1995年   118篇
  1994年   129篇
  1993年   128篇
  1992年   85篇
  1991年   67篇
  1990年   76篇
  1989年   73篇
  1988年   67篇
  1987年   58篇
  1986年   75篇
  1985年   74篇
  1984年   83篇
  1983年   69篇
  1982年   97篇
  1981年   71篇
  1980年   88篇
  1978年   64篇
  1977年   58篇
  1976年   46篇
  1975年   54篇
  1974年   48篇
  1973年   54篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
2.
3.
4.
5.
6.
CONTEXT: The physician assistant profession has been moving toward requiring master's degrees for new practitioners, but some argue this could change the face of the discipline. PURPOSE: To see if there is an association between physician assistants' academic degrees and practice in primary care, in rural areas, and with the medically underserved. METHODS: Surveys were sent to 880 graduates of the first 32 University of Washington physician assistant classes through 2000. Respondents noted their academic degree at program entry and the highest degree attained at any time up to the time of survey. Relationships between practice characteristics and academic degree levels were tested by unadjusted odds ratios and logistic regression after controlling for year of graduation and sex. RESULTS: Of the 478 respondents, 54% worked in primary care, about 30% practiced in nonmetropolitan communities, and 42% reported providing care for the medically underserved. Respondents with no degree (33% of total at entry, 24% at survey) were significantly more likely than degree holders to work in primary care and nonmetropolitan areas. Respondents with no degree at program entry were significantly more likely, and those with no degree at the time of the survey were marginally more likely, to self-report work with the medically underserved. CONCLUSION: Respondents with no academic degree are significantly more likely to demonstrate a commitment to primary, rural, and underserved health care. These findings may inform the national debate about the impact of required advanced degrees on the practice patterns of nonphysician providers.  相似文献   
7.
8.
9.
OBJECTIVE: Outcomes analysis in congenital diaphragmatic hernia (CDH) requires a validated risk-adjustment tool. The purpose of this study was to use the Canadian Neonatal Network (CNN) database to validate the Score for Neonatal Acute Physiology, Version II (SNAP-II) for prediction of mortality among CDH infants admitted to a neonatal intensive care unit (NICU), and to compare this to the predictive equation recently developed by the Congenital Diaphragmatic Hernia Study Group (CDHSG). STUDY DESIGN: Infants with CDH in the CNN database were identified. Bivariate and multivariable logistic regression models were used to identify risk factors predictive of mortality. Model predictive performance and calibration were assessed using the area under the receiver operator characteristic curve and the technique of Hosmer-Lemeshow, respectively, and compared with the CDHSG predictive equation. RESULTS: There were 88 patients with CDH among 19,507 admissions to CNN hospitals. The mortality rate among CDH patients surviving to NICU admission was 17%, and 12.5% received extracorporeal membrane oxygenation therapy. Gestational age and admission SNAP-II score predicted mortality. Model predictive performance and calibration were optimized with these variables combined. The CDHSG equation was equally predictive of mortality, but was only marginally calibrated. CONCLUSIONS: SNAP-II is highly predictive of mortality among patients with CDH, and can be used to risk-adjust these patients.  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