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   1348886篇
  免费   103921篇
  国内免费   4268篇
耳鼻咽喉   16924篇
儿科学   44147篇
妇产科学   36959篇
基础医学   200009篇
口腔科学   36360篇
临床医学   131423篇
内科学   261330篇
皮肤病学   26579篇
神经病学   113014篇
特种医学   48718篇
外国民族医学   366篇
外科学   185921篇
综合类   29120篇
现状与发展   1篇
一般理论   494篇
预防医学   116058篇
眼科学   29245篇
药学   100379篇
  6篇
中国医学   3175篇
肿瘤学   76847篇
  2021年   11121篇
  2019年   11890篇
  2018年   16576篇
  2017年   12510篇
  2016年   13475篇
  2015年   15421篇
  2014年   21159篇
  2013年   32567篇
  2012年   44919篇
  2011年   47624篇
  2010年   27452篇
  2009年   25286篇
  2008年   43370篇
  2007年   45817篇
  2006年   45882篇
  2005年   44297篇
  2004年   42220篇
  2003年   40148篇
  2002年   38929篇
  2001年   61353篇
  2000年   63082篇
  1999年   52760篇
  1998年   14782篇
  1997年   13432篇
  1996年   13274篇
  1995年   12621篇
  1994年   11779篇
  1993年   11081篇
  1992年   41934篇
  1991年   41134篇
  1990年   39836篇
  1989年   37718篇
  1988年   34928篇
  1987年   34046篇
  1986年   32485篇
  1985年   30953篇
  1984年   23328篇
  1983年   19826篇
  1982年   11934篇
  1979年   21036篇
  1978年   15030篇
  1977年   12209篇
  1976年   12036篇
  1975年   12268篇
  1974年   14971篇
  1973年   14623篇
  1972年   13519篇
  1971年   12518篇
  1970年   11630篇
  1969年   10514篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
11.
The coronavirus disease 2019 (COVID-19) pandemic has rapidly created widespread impacts on global health and the economy. Data suggest that women are less susceptible to severe illness. However, sex-disaggregated data are incomplete, leaving room for misinterpretation, and focusing only on biologic sex underestimates the gendered impact of the pandemic on women. This narrative review summarizes what is known about gender disparities during the COVID-19 pandemic and the economic, domestic, and health burdens along with overlapping vulnerabilities related to the pandemic. In addition, this review outlines recommended strategies that advocacy groups, community leaders, and policymakers should implement to mitigate the widening gender disparities related to COVID-19.  相似文献   
12.
13.
14.
The coronavirus 2019 pandemic has affected almost every aspect of health care delivery in the United States, and the emergency medicine system has been hit particularly hard while dealing with this public health crisis. In an unprecedented time in our history, medical systems and clinicians have been asked to be creative, flexible, and innovative, all while continuing to uphold the important standards in the US health care system. To continue providing quality services to patients during this extraordinary time, care providers, organizations, administrators, and insurers have needed to alter longstanding models and procedures to respond to the dynamics of a pandemic. The Emergency Medicine Treatment and Active Labor Act of 1986, or EMTALA, is 1 example of where these alterations have allowed health care facilities and clinicians to continue their work of caring for patients while protecting both the patients and the clinicians themselves from infectious exposures at the same time.  相似文献   
15.
16.
17.
18.
19.
Cognitive Therapy and Research - Despite interest in psychological inflexibility as a marker of suicide risk, no measure of psychological inflexibility specific to SI exists. The present study...  相似文献   
20.
Gestational trophoblastic neoplasia (GTN) patients are treated according to the eight-variable International Federation of Gynaecology and Obstetrics (FIGO) scoring system, that aims to predict first-line single-agent chemotherapy resistance. FIGO is imperfect with one-third of low-risk patients developing disease resistance to first-line single-agent chemotherapy. We aimed to generate simplified models that improve upon FIGO. Logistic regression (LR) and multilayer perceptron (MLP) modelling (n = 4191) generated six models (M1-6). M1, all eight FIGO variables (scored data); M2, all eight FIGO variables (scored and raw data); M3, nonimaging variables (scored data); M4, nonimaging variables (scored and raw data); M5, imaging variables (scored data); and M6, pretreatment hCG (raw data) + imaging variables (scored data). Performance was compared to FIGO using true and false positive rates, positive and negative predictive values, diagnostic odds ratio, receiver operating characteristic (ROC) curves, Bland-Altman calibration plots, decision curve analysis and contingency tables. M1-6 were calibrated and outperformed FIGO on true positive rate and positive predictive value. Using LR and MLP, M1, M2 and M4 generated small improvements to the ROC curve and decision curve analysis. M3, M5 and M6 matched FIGO or performed less well. Compared to FIGO, most (excluding LR M4 and MLP M5) had significant discordance in patient classification (McNemar's test P < .05); 55-112 undertreated, 46-206 overtreated. Statistical modelling yielded only small gains over FIGO performance, arising through recategorisation of treatment-resistant patients, with a significant proportion of under/overtreatment as the available data have been used a priori to allocate primary chemotherapy. Streamlining FIGO should now be the focus.  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