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   540336篇
  免费   29180篇
  国内免费   503篇
耳鼻咽喉   6783篇
儿科学   17384篇
妇产科学   12902篇
基础医学   94342篇
口腔科学   12663篇
临床医学   49596篇
内科学   97589篇
皮肤病学   11979篇
神经病学   35234篇
特种医学   20275篇
外国民族医学   53篇
外科学   79212篇
综合类   7752篇
现状与发展   2篇
一般理论   114篇
预防医学   39541篇
眼科学   12079篇
药学   42164篇
  1篇
中国医学   1140篇
肿瘤学   29214篇
  2021年   4038篇
  2019年   4062篇
  2018年   5936篇
  2017年   4298篇
  2016年   5070篇
  2015年   5566篇
  2014年   7371篇
  2013年   10916篇
  2012年   16137篇
  2011年   18041篇
  2010年   10280篇
  2009年   9141篇
  2008年   16252篇
  2007年   17933篇
  2006年   17441篇
  2005年   16753篇
  2004年   16349篇
  2003年   15687篇
  2002年   15172篇
  2001年   22821篇
  2000年   23354篇
  1999年   19290篇
  1998年   5388篇
  1997年   4499篇
  1996年   4507篇
  1995年   4246篇
  1992年   14669篇
  1991年   16086篇
  1990年   16164篇
  1989年   15851篇
  1988年   14525篇
  1987年   14367篇
  1986年   13327篇
  1985年   12837篇
  1984年   9527篇
  1983年   8111篇
  1982年   4238篇
  1979年   9024篇
  1978年   6452篇
  1977年   5228篇
  1976年   5564篇
  1975年   6692篇
  1974年   7507篇
  1973年   7218篇
  1972年   6654篇
  1971年   6379篇
  1970年   5947篇
  1969年   5521篇
  1968年   5200篇
  1967年   4659篇
排序方式: 共有10000条查询结果,搜索用时 171 毫秒
1.
PurposeUnderstanding the value of genetic screening and testing for monogenic disorders requires high-quality, methodologically robust economic evaluations. This systematic review sought to assess the methodological quality among such studies and examined opportunities for improvement.MethodsWe searched PubMed, Cochrane, Embase, and Web of Science for economic evaluations of genetic screening/testing (2013-2019). Methodological rigor and adherence to best practices were systematically assessed using the British Medical Journal checklist.ResultsAcross the 47 identified studies, there were substantial variations in modeling approaches, reporting detail, and sophistication. Models ranged from simple decision trees to individual-level microsimulations that compared between 2 and >20 alternative interventions. Many studies failed to report sufficient detail to enable replication or did not justify modeling assumptions, especially for costing methods and utility values. Meta-analyses, systematic reviews, or calibration were rarely used to derive parameter estimates. Nearly all studies conducted some sensitivity analysis, and more sophisticated studies implemented probabilistic sensitivity/uncertainty analysis, threshold analysis, and value of information analysis.ConclusionWe describe a heterogeneous body of work and present recommendations and exemplar studies across the methodological domains of (1) perspective, scope, and parameter selection; (2) use of uncertainty/sensitivity analyses; and (3) reporting transparency for improvement in the economic evaluation of genetic screening/testing.  相似文献   
2.
Journal of Behavioral Medicine - Evidence supports the use of graphic warnings to educate the public about the health harms of smoking and suggests warnings eliciting negative emotional responses...  相似文献   
3.
The adrenal cortex gives rise to a biologically heterogenous group of neoplasms, each with a distinct morphology, antigen expression and molecular profile. Adrenal cortical adenomas have excellent prognosis and are usually cured by surgical resection alone, while adrenal cortical carcinomas are very aggressive tumors with a poor prognosis regardless of therapy. These tumors are rare and often challenging for a pathologist to diagnose, as significant overlap exists between benign and malignant lesions in some cases. In this review, we attempt to summarize most important histologic and clinical features of adrenal cortical adenomas and carcinomas, clarify the use of different grading systems, the use of special stains and the differential diagnosis for practicing pathologists. Most relevant hereditary syndromes associated with adrenal cortical tumors are listed. Updates in molecular alterations in adrenal cortical neoplasms and hyperplastic diseases as well as their clinical significance and potential therapeutic implications are also discussed.  相似文献   
4.
5.
6.
Journal of Immigrant and Minority Health - COVID-19 has disproportionally affected underrepresented minorities (URM) and low-income immigrants in the United States. The aim of the study is to...  相似文献   
7.
8.
Pharmaceutical Chemistry Journal - An HPLC-MS method for simultaneous quantitative determination of a novel gestagenic pharmaceutical and two of its metabolites in rat and rabbit blood sera was...  相似文献   
9.
Bulletin of Experimental Biology and Medicine - Ammonium, an end-product of catabolism, in low doses can promote adaptation of metabolic pathways in erythrocytes under conditions of extreme...  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