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   121645篇
  免费   7514篇
  国内免费   725篇
耳鼻咽喉   1203篇
儿科学   3890篇
妇产科学   2841篇
基础医学   17639篇
口腔科学   4612篇
临床医学   11142篇
内科学   27287篇
皮肤病学   3252篇
神经病学   11923篇
特种医学   2875篇
外国民族医学   1篇
外科学   11065篇
综合类   426篇
一般理论   56篇
预防医学   11746篇
眼科学   2084篇
药学   8608篇
中国医学   484篇
肿瘤学   8750篇
  2023年   1130篇
  2022年   982篇
  2021年   3832篇
  2020年   2746篇
  2019年   3713篇
  2018年   4224篇
  2017年   3155篇
  2016年   3690篇
  2015年   4061篇
  2014年   5346篇
  2013年   6938篇
  2012年   10604篇
  2011年   11006篇
  2010年   5944篇
  2009年   5013篇
  2008年   8620篇
  2007年   8576篇
  2006年   7879篇
  2005年   7329篇
  2004年   6565篇
  2003年   5805篇
  2002年   5189篇
  2001年   590篇
  2000年   383篇
  1999年   558篇
  1998年   669篇
  1997年   568篇
  1996年   462篇
  1995年   494篇
  1994年   454篇
  1993年   390篇
  1992年   305篇
  1991年   216篇
  1990年   209篇
  1989年   200篇
  1988年   184篇
  1987年   149篇
  1986年   165篇
  1985年   119篇
  1984年   150篇
  1983年   137篇
  1982年   161篇
  1981年   116篇
  1980年   125篇
  1979年   75篇
  1978年   80篇
  1977年   72篇
  1976年   58篇
  1975年   46篇
  1974年   54篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
2.
Postbariatric loss of muscle tissue could negatively affect long-term health due to its role in various bodily processes, such as metabolism and functional capacity. This meta-analysis aimed to unravel time-dependent changes in the magnitude and progress of lean body mass (LBM), fat-free mass (FFM), and skeletal muscle mass (SMM) loss following bariatric surgery. A systematic literature search was conducted in Pubmed, Embase, and Web of Science. Fifty-nine studies assessed LBM (n = 37), FFM (n = 20), or SMM (n = 3) preoperatively and ≥1 time points postsurgery. Random-effects meta-analyses were performed to determine pooled loss per outcome parameter and follow-up time point. At 12-month postsurgery, pooled LBM loss was ?8.13 kg [95%CI ?9.01; ?7.26]. FFM loss and SMM loss were ?8.23 kg [95%CI ?10.74; ?5.73] and ?3.18 kg [95%CI ?5.64; ?0.71], respectively. About 55% of 12-month LBM loss occurred within 3-month postsurgery, followed by a more gradual decrease up to 12 months. Similar patterns were seen for FFM and SMM. In conclusion, >8 kg of LBM and FFM loss was observed within 1-year postsurgery. LBM, FFM, and SMM were predominantly lost within 3-month postsurgery, highlighting that interventions to mitigate such losses should be implemented perioperatively.  相似文献   
3.
4.
5.
Journal of Medical Ultrasonics - Chronic liver disease is still a major problem because disease progression will ultimately lead to liver cirrhosis. Portal hypertension is the hallmark in advanced...  相似文献   
6.

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   
7.
8.
The coronavirus disease 2019, which is caused by severe acute respiratory syndrome coronavirus 2, was first identified in December 2019 in Wuhan, China, and has since spread rapidly, evolving into a full-blown pandemic. We would like to report our experience after 1 year of this pandemic in the surgical service of a district hospital in Spain. There have been many changes (including new protocols) that our service and the hospital have undergone, to adapt to the new situation. We believe that this experience can be useful for other professionals who have lived and are living a similar situation.  相似文献   
9.
Sport Sciences for Health - This study aimed to review the existing literature concerning the psychological variables of CrossFit participants. This review followed the PRISMA guidelines and was...  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