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   1358658篇
  免费   103948篇
  国内免费   4385篇
耳鼻咽喉   16979篇
儿科学   44395篇
妇产科学   37137篇
基础医学   201381篇
口腔科学   36426篇
临床医学   132225篇
内科学   262779篇
皮肤病学   26806篇
神经病学   114165篇
特种医学   49071篇
外国民族医学   366篇
外科学   187374篇
综合类   29377篇
现状与发展   2篇
一般理论   483篇
预防医学   116480篇
眼科学   29482篇
药学   100642篇
  7篇
中国医学   3277篇
肿瘤学   78137篇
  2021年   11756篇
  2019年   12497篇
  2018年   17179篇
  2017年   13001篇
  2016年   13955篇
  2015年   16014篇
  2014年   21833篇
  2013年   33365篇
  2012年   46348篇
  2011年   48947篇
  2010年   28233篇
  2009年   25981篇
  2008年   44337篇
  2007年   46646篇
  2006年   46635篇
  2005年   45108篇
  2004年   42883篇
  2003年   40659篇
  2002年   39439篇
  2001年   61301篇
  2000年   62823篇
  1999年   52615篇
  1998年   14774篇
  1997年   13475篇
  1996年   13239篇
  1995年   12582篇
  1994年   11725篇
  1993年   11005篇
  1992年   41708篇
  1991年   40886篇
  1990年   39597篇
  1989年   37471篇
  1988年   34699篇
  1987年   33812篇
  1986年   32263篇
  1985年   30716篇
  1984年   23085篇
  1983年   19632篇
  1982年   11790篇
  1979年   20855篇
  1978年   14851篇
  1977年   12095篇
  1976年   11901篇
  1975年   12135篇
  1974年   14822篇
  1973年   14497篇
  1972年   13371篇
  1971年   12435篇
  1970年   11495篇
  1969年   10418篇
排序方式: 共有10000条查询结果,搜索用时 31 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