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   1320751篇
  免费   97003篇
  国内免费   2208篇
耳鼻咽喉   18668篇
儿科学   43145篇
妇产科学   38435篇
基础医学   192967篇
口腔科学   36441篇
临床医学   112903篇
内科学   261503篇
皮肤病学   27462篇
神经病学   104298篇
特种医学   52298篇
外国民族医学   373篇
外科学   205152篇
综合类   26794篇
现状与发展   1篇
一般理论   313篇
预防医学   94729篇
眼科学   29658篇
药学   100465篇
  1篇
中国医学   2563篇
肿瘤学   71793篇
  2018年   13121篇
  2016年   11257篇
  2015年   13044篇
  2014年   17796篇
  2013年   26608篇
  2012年   37113篇
  2011年   39536篇
  2010年   23330篇
  2009年   21952篇
  2008年   38040篇
  2007年   41117篇
  2006年   41384篇
  2005年   40638篇
  2004年   38886篇
  2003年   37814篇
  2002年   37098篇
  2001年   58510篇
  2000年   59910篇
  1999年   51101篇
  1998年   14709篇
  1997年   13173篇
  1996年   13356篇
  1995年   12567篇
  1994年   11975篇
  1993年   11019篇
  1992年   41153篇
  1991年   40504篇
  1990年   40005篇
  1989年   38827篇
  1988年   36227篇
  1987年   35438篇
  1986年   33817篇
  1985年   32217篇
  1984年   24035篇
  1983年   20914篇
  1982年   12458篇
  1981年   10991篇
  1979年   22695篇
  1978年   15933篇
  1977年   13781篇
  1976年   13017篇
  1975年   14257篇
  1974年   16733篇
  1973年   16126篇
  1972年   15351篇
  1971年   14257篇
  1970年   13241篇
  1969年   12769篇
  1968年   12008篇
  1967年   10498篇
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
1.
2.
3.
4.
5.
6.
7.
8.
Vaccination is a vital health care initiative to prevent individual and population infection. To increase vaccination rates the federal government implemented the ‘No Jab, No Pay’ policy, where eligibility for several government benefits required children to be fully vaccinated by removing ‘conscientious objections’ and expanding the age range of children whose families receive benefits. This study assesses the impact of this policy at a local area within a single medical practice community in NSW, Australia. A retrospective clinical audit was performed between 2012 and 2017 on a single general practice's vaccination records for children ≤19 years. Catch-up vaccinations were assessed based on age at vaccination. Incidence of catch-up vaccinations was assessed for each of four years before and two years after the implementation of the ‘No Jab, No Pay’ policy in January 2016, along with the age of children and vaccination(s) given. Catch-up vaccinations were assessed temporally either side of implementation of ‘No Jab, No Pay’. Comparing the average annual vaccination catch-up incidence rate of 6.2% pre-implementation (2012–2015), there was an increase to 9.2% in 2016 (p < .001) and 7.8% in 2017 (p = .027). Secondary outcome measurement of catch-up vaccination incidence rates before (2012–2015) and after (2016–2017) ‘No Jab, No Pay’ implementation showed statistically significant increases for children aged 8–11 years (3.2%–5.6%, p = .038), 12–15 years (7.5%–14.7%, p < .001) and 16–19 years (3.3%–10.2%, p < .001) along with a statistically significant reduction in children aged 1–3 years (11.4%–6.2%, p = .015). Also, catch-up rates for DTPa significantly increased after program implementation. This study demonstrates that the Australian federal government vaccination policy ‘No Jab, No Pay’ was coincident with an increase in catch-up vaccinations within a rural NSW community served by one medical practice, especially for older children.  相似文献   
9.

Background

Hyperglycaemia is common in patients with acute brain injury admitted to an intensive care unit (ICU). Many studies have found associations between development of hyperglycaemia and increased mortality in hospitalised patients. However, the optimal target for blood glucose control is unknown. We want to conduct a systematic review with meta-analysis and trial sequential analysis to explore the beneficial and harmful effects of restrictive versus liberal glucose control on patient outcomes in adults with severe acute brain injury.

Methods

We will systematically search medical databases including CENTRAL, Embase, MEDLINE and trial registries. We will search the following websites for ongoing or unpublished trials: http://www.controlled-trials.com/ , http://www.clinicaltrials.gov/ , www.eudraCT.com , http://centerwatch.com/ , The Cochrane Library's CENTRAL, PubMed, EMBASE, Science Citation Index Expanded and CINAHL. Two authors will independently review and select trials and extract data. We will include randomised trials comparing levels of glucose control in our analyses and observational studies will be included to address potential harms. The primary outcomes are defined as all-cause mortality, functional outcome and health-related quality of life. Secondary outcomes include serious adverse events including hypoglycaemia, length of ICU stay and duration of mechanical ventilation, and explorative outcomes including intracranial pressure and infection. Trial Sequential Analysis will be used to investigate the risk of type I error due to repetitive testing and to further explore imprecision. Quality of trials will be evaluated using the Cochrane Risk of Bias tool, and quality of evidence will be assessed using the Grading of Recommendations, Assessment, Development and Evaluations (GRADE) approach.

Discussion

The results of the systematic review will be disseminated through peer-reviewed publication. With the review, we hope to inform future randomised clinical trials and improve clinical practice.  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