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   1219584篇
  免费   83454篇
  国内免费   1959篇
耳鼻咽喉   16631篇
儿科学   38184篇
妇产科学   30984篇
基础医学   172764篇
口腔科学   32767篇
临床医学   109613篇
内科学   234530篇
皮肤病学   27379篇
神经病学   95047篇
特种医学   49316篇
外国民族医学   215篇
外科学   186251篇
综合类   23523篇
现状与发展   1篇
一般理论   375篇
预防医学   85694篇
眼科学   27569篇
药学   95551篇
  7篇
中国医学   3019篇
肿瘤学   75577篇
  2021年   10586篇
  2019年   10597篇
  2018年   14537篇
  2017年   11420篇
  2016年   12961篇
  2015年   14499篇
  2014年   19908篇
  2013年   28517篇
  2012年   39960篇
  2011年   42363篇
  2010年   24782篇
  2009年   23367篇
  2008年   38887篇
  2007年   41399篇
  2006年   42000篇
  2005年   40355篇
  2004年   38299篇
  2003年   36474篇
  2002年   35137篇
  2001年   62000篇
  2000年   63148篇
  1999年   52862篇
  1998年   14244篇
  1997年   12447篇
  1996年   12258篇
  1995年   11514篇
  1994年   10405篇
  1993年   9800篇
  1992年   39020篇
  1991年   37388篇
  1990年   36723篇
  1989年   35221篇
  1988年   31748篇
  1987年   30814篇
  1986年   29062篇
  1985年   27280篇
  1984年   20056篇
  1983年   16901篇
  1982年   9732篇
  1979年   17651篇
  1978年   12059篇
  1977年   10756篇
  1976年   9333篇
  1975年   10496篇
  1974年   12139篇
  1973年   11732篇
  1972年   11151篇
  1971年   10397篇
  1970年   9547篇
  1969年   9174篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
21.
22.
23.
24.
25.
26.
Emergency Medicine staff in Australia and New Zealand are at the forefront of the healthcare response to COVID‐19. This article describes a well‐being plan for ED staff that has been devised to mitigate against the negative psychological impact of the COVID‐19 pandemic.  相似文献   
27.
28.
29.
BACKGROUND Approximately 20% of patients with neuroendocrine tumours(NETs) develop carcinoid syndrome(CS),characterised by flushing and diarrhoea.Somatostatin analogues or telotristat can be used to control symptoms of CS through inhibition of serotonin secretion.Although CS is often the cause of diarrhoea among patients with gastroenteropancreatic NETs(GEP-NETs),other causes to consider include pancreatic enzyme insufficiency(PEI),bile acid malabsorption and small intestinal bacterial overgrowth.If other causes of diarrhoea unrelated to serotonin secretion are mistaken for CS diarrhoea,these treatments may be ineffective against the diarrhoea,risking detrimental effects to patient quality of life.AIM To identify and synthesise qualitative and quantitative evidence relating to the differential diagnosis of diarrhoea in patients with GEP-NETs.METHODS Electronic databases(MEDLINE,Embase and the Cochrane Library) were searched from inception to September 12,2018 using terms for NETs and diarrhoea.Congresses,systematic literature review bibliographies and included articles were also hand-searched.Any study designs and publication types were eligible for inclusion if relevant data on a cause(s) of diarrhoea in patients with GEP-NETs were reported.Studies were screened by two independent reviewers at abstract and full-text stages.Framework synthesis was adapted to synthesise quantitative and qualitative data.The definition of qualitative data was expanded to include all textual data in any section of relevant publications.RESULTS Forty-seven publications(44 studies) were included,comprising a variety of publication types,including observational studies,reviews,guidelines,case reports,interventional studies,and opinion pieces.Most reported on PEI on/after treatment with somatostatin analogs;9.5%-84% of patients with GEP-NETs had experienced steatorrhoea or confirmed PEI.Where reported,14.3%–50.7% of patients received pancreatic enzyme replacement therapy.Other causes of diarrhoea reported in patients with GEP-NETs included bile acid malabsorption(80%),small intestinal bacterial overgrowth(23.6%-62%),colitis(20%) and infection(7.1%).Diagnostic approaches included faecal elastase,breath tests,tauroselcholic(selenium-75) acid(Se HCAT) scan and stool culture,although evidence on the effectiveness or diagnostic accuracy of these approaches was limited.Assessment of patient history or diarrhoea characteristics was also reported as initial approaches for investigation.From the identified evidence,if diarrhoea is assumed to be CS diarrhoea,consequences include uncontrolled diarrhoea,malnutrition,and perceived ineffectiveness of CS treatment.Approaches for facilitating differential diagnosis of diarrhoea include improving patient and clinician awareness of non-CS causes and involvement of a multidisciplinary clinical team,including gastroenterologists.CONCLUSION Diarrhoea in GEP-NETs can be multifactorial with misdiagnosis leading to delayed patient recovery and inefficient resource use.This systematic literature review highlights gaps for further research on prevalence of non-CS diarrhoea and suitability of diagnostic approaches,to determine an effective algorithm for differential diagnosis of GEP-NET diarrhoea.  相似文献   
30.
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