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   2182877篇
  免费   160751篇
  国内免费   4716篇
耳鼻咽喉   28521篇
儿科学   71836篇
妇产科学   58790篇
基础医学   317662篇
口腔科学   63590篇
临床医学   196972篇
内科学   423924篇
皮肤病学   49640篇
神经病学   166205篇
特种医学   81694篇
外国民族医学   316篇
外科学   329130篇
综合类   49814篇
现状与发展   5篇
一般理论   663篇
预防医学   161895篇
眼科学   52197篇
药学   161198篇
  9篇
中国医学   6146篇
肿瘤学   128137篇
  2021年   16597篇
  2019年   17279篇
  2018年   25128篇
  2017年   19235篇
  2016年   21123篇
  2015年   23905篇
  2014年   33071篇
  2013年   48553篇
  2012年   66702篇
  2011年   70291篇
  2010年   41660篇
  2009年   38992篇
  2008年   65231篇
  2007年   69584篇
  2006年   70059篇
  2005年   66829篇
  2004年   64563篇
  2003年   61409篇
  2002年   59113篇
  2001年   114092篇
  2000年   116241篇
  1999年   95950篇
  1998年   25121篇
  1997年   21788篇
  1996年   22002篇
  1995年   21227篇
  1994年   19479篇
  1993年   17940篇
  1992年   72513篇
  1991年   70732篇
  1990年   68068篇
  1989年   65780篇
  1988年   59963篇
  1987年   58325篇
  1986年   55193篇
  1985年   52089篇
  1984年   38376篇
  1983年   32609篇
  1982年   18243篇
  1979年   34001篇
  1978年   23683篇
  1977年   20062篇
  1976年   18891篇
  1975年   20100篇
  1974年   24082篇
  1973年   23198篇
  1972年   21700篇
  1971年   20041篇
  1970年   18840篇
  1969年   17527篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
11.
The coronavirus disease 2019 (COVID-19) pandemic has rapidly created widespread impacts on global health and the economy. Data suggest that women are less susceptible to severe illness. However, sex-disaggregated data are incomplete, leaving room for misinterpretation, and focusing only on biologic sex underestimates the gendered impact of the pandemic on women. This narrative review summarizes what is known about gender disparities during the COVID-19 pandemic and the economic, domestic, and health burdens along with overlapping vulnerabilities related to the pandemic. In addition, this review outlines recommended strategies that advocacy groups, community leaders, and policymakers should implement to mitigate the widening gender disparities related to COVID-19.  相似文献   
12.
13.
IntroductionHip displacement is common in cerebral palsy (CP) and is related to the severity of neurological and functional impairment. It is a silent, but progressive disease, and can result in significant morbidity and decreased quality of life, if left untreated. The pathophysiology of hip displacement in CP is a combination of hip flexor-adductor muscle spasticity, abductor muscle weakness, and delayed weight-bearing, resulting in proximal femoral deformities and progressive acetabular dysplasia. Due to a lack of symptoms in the early stages of hip displacement, the diagnosis is easily missed. Awareness of this condition and regular surveillance by clinical examination and serial radiographs of the hips are the key to early diagnosis and treatment.Hip surveillance programmesSeveral population-based studies from around the world have demonstrated that universal hip surveillance in children with CP allows early detection of hip displacement and appropriate early intervention, with a resultant decrease in painful dislocations. Global hip surveillance models are based upon the patients’ age, functional level determined by the Gross Motor Function Classification system (GMFCS), gait classification, standardized clinical exam, and radiographic indices such as the migration percentage (MP), as critical indicators of progressive hip displacement.ConclusionDespite 25 years of evidence showing the efficacy of established hip surveillance programmes, there is poor awareness among healthcare professionals in India about the importance of regular hip surveillance in children with CP. There is a need for professional organizations to develop evidence-based guidelines for hip surveillance which are relevant to the Indian context.  相似文献   
14.
15.
16.
17.
Comprehensive evidence regarding the treatment of non-anaemic iron deficiency in patients undergoing valvular heart surgery is lacking. This study aimed to investigate the association between non-anaemic iron deficiency and postoperative outcomes in these patients. We retrospectively analysed 321 patients of which 180 (56%) had iron deficiency (defined as serum ferritin < 100 ng.ml-1 or < 300 ng.ml-1 with transferrin saturation < 20%). While the iron-deficient group had lower pre-operative haemoglobin levels than the non-iron deficient group (median (IQR [range]) 134 (127–141 [120–172]) g.l-1, 143 (133–150 [120–179]) g.l-1, p = 0.001), there was no between-group difference in allogeneic red blood cell transfusion. Median (IQR [range]) days alive and out of hospital at postoperative day 90 was 1 day shorter in the iron-deficient group (80 (77–82 [9–85]) days vs. 81 (79–83 [0–85]) days, p = 0.026). In multivariable analysis, only cardiopulmonary bypass duration (p = 0.032) and intra-operative allogeneic red blood cell transfusion (p = 0.011) were significantly associated with reduced days alive and out of hospital at postoperative day 90. Iron deficiency did not exert any adverse influence on secondary outcomes except length of hospital stay. Our findings indicate that non-anaemic iron deficiency alone is not associated with adverse effects in patients undergoing valvular heart surgery when it does not translate into an increased risk of allogeneic transfusion.  相似文献   
18.
19.
20.
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