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   1685261篇
  免费   126568篇
  国内免费   3763篇
耳鼻咽喉   21728篇
儿科学   55516篇
妇产科学   46168篇
基础医学   239830篇
口腔科学   48757篇
临床医学   150400篇
内科学   331364篇
皮肤病学   38680篇
神经病学   130429篇
特种医学   63892篇
外国民族医学   242篇
外科学   257005篇
综合类   38824篇
现状与发展   4篇
一般理论   531篇
预防医学   123473篇
眼科学   40039篇
药学   123478篇
  7篇
中国医学   4347篇
肿瘤学   100878篇
  2019年   13566篇
  2018年   19988篇
  2017年   15250篇
  2016年   16653篇
  2015年   19015篇
  2014年   26302篇
  2013年   38023篇
  2012年   52869篇
  2011年   55542篇
  2010年   32856篇
  2009年   30761篇
  2008年   51648篇
  2007年   54947篇
  2006年   55383篇
  2005年   52697篇
  2004年   50880篇
  2003年   48170篇
  2002年   46389篇
  2001年   91759篇
  2000年   93495篇
  1999年   76660篇
  1998年   18808篇
  1997年   16280篇
  1996年   16433篇
  1995年   16653篇
  1994年   15242篇
  1993年   14011篇
  1992年   57354篇
  1991年   55286篇
  1990年   52981篇
  1989年   50750篇
  1988年   46139篇
  1987年   44944篇
  1986年   42231篇
  1985年   40007篇
  1984年   29334篇
  1983年   24865篇
  1982年   13847篇
  1981年   12331篇
  1979年   25487篇
  1978年   17541篇
  1977年   14862篇
  1976年   13843篇
  1975年   14528篇
  1974年   17621篇
  1973年   16919篇
  1972年   15671篇
  1971年   14443篇
  1970年   13427篇
  1969年   12516篇
排序方式: 共有10000条查询结果,搜索用时 250 毫秒
21.
22.
23.
Brandt  L.  Albert  S.  Brandt  K. L. 《Der Anaesthesist》2022,71(11):858-864
Die Anaesthesiologie - Als Meralgia paraesthetica (MP) bezeichnet man eine zu den neurologischen Engpasssyndromen zählende Schädigung des aus dem Plexus lumbalis entspringenden sensiblen...  相似文献   
24.
Delirium is one of the most commonly occurring postoperative complications in older adults. It occurs due to the vulnerability of cerebral functioning to pathophysiological stressors. Identification of those at increased risk of developing delirium early in the surgical pathway provides an opportunity for modification of predisposing and precipitating risk factors and effective shared decision-making. No single delirium prediction tool is used widely in surgical settings. Multi-component interventions to prevent delirium involve structured risk factor modification supported by geriatrician input; these are clinically efficacious and cost effective. Barriers to the widespread implementation of such complex interventions exist, resulting in an ‘implementation gap’. There is a lack of evidence for pharmacological prophylaxis for the prevention of delirium. Current evidence suggests that avoidance of peri-operative benzodiazepines, careful titration of anaesthetic depth guided by processed electroencephalogram monitoring and treatment of pain are the most effective strategies to minimise the risk of delirium. Addressing postoperative delirium requires a collaborative, whole pathway approach, beginning with the early identification of those patients who are at risk. The research agenda should continue to examine the potential for pharmacological prophylaxis to prevent delirium while also addressing how successful models of delirium prevention can be translated from one setting to another, underpinned by implementation science methodology.  相似文献   
25.
26.
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   
27.
28.
Purpose

A systematic review was undertaken to determine whether research supports: (i) an association between income inequality and adult mental health when measured at the subnational level, and if so, (ii) in a way that supports the Income Inequality Hypothesis (i.e. between higher inequality and poorer mental health) or the Mixed Neighbourhood Hypothesis (higher inequality and better mental health).

Methods

Systematic searches of PsycINFO, Medline and Web of Science databases were undertaken from database inception to September 2020. Included studies appeared in English-language, peer-reviewed journals and incorporated measure/s of objective income inequality and adult mental illness. Papers were excluded if they focused on highly specialised population samples. Study quality was assessed using a custom-developed tool and data synthesised using the vote-count method.

Results

Forty-two studies met criteria for inclusion representing nearly eight million participants and more than 110,000 geographical units. Of these, 54.76% supported the Income Inequality Hypothesis and 11.9% supported the Mixed Neighbourhood Hypothesis. This held for highest quality studies and after controlling for absolute deprivation. The results were consistent across mental health conditions, size of geographical units, and held for low/middle and high income countries.

Conclusions

A number of limitations in the literature were identified, including a lack of appropriate (multi-level) analyses and modelling of relevant confounders (deprivation) in many studies. Nonetheless, the findings suggest that area-level income inequality is associated with poorer mental health, and provides support for the introduction of social, economic and public health policies that ameliorate the deleterious effects of income inequality.

Clinical registration number

PROSPERO 2020 CRD42020181507.

  相似文献   
29.
Die Anaesthesiologie - Auch wenn für Anästhesiologen über Jahrzehnte die Prophylaxe und Therapie postoperativer Schmerzen im Rahmen des postoperativen Patientenkomforts an vorderster...  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