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   3608295篇
  免费   272711篇
  国内免费   10975篇
耳鼻咽喉   49284篇
儿科学   118978篇
妇产科学   100081篇
基础医学   507436篇
口腔科学   102584篇
临床医学   328921篇
内科学   702261篇
皮肤病学   83368篇
神经病学   295663篇
特种医学   141005篇
外国民族医学   1136篇
外科学   539286篇
综合类   84380篇
现状与发展   10篇
一般理论   1401篇
预防医学   280781篇
眼科学   82641篇
药学   268789篇
  28篇
中国医学   9351篇
肿瘤学   194597篇
  2018年   38871篇
  2017年   30334篇
  2016年   34808篇
  2015年   39886篇
  2014年   54518篇
  2013年   81502篇
  2012年   108442篇
  2011年   114493篇
  2010年   69061篇
  2009年   65823篇
  2008年   106785篇
  2007年   113062篇
  2006年   114799篇
  2005年   110564篇
  2004年   107008篇
  2003年   103196篇
  2002年   99896篇
  2001年   168184篇
  2000年   172645篇
  1999年   146070篇
  1998年   42330篇
  1997年   37866篇
  1996年   37809篇
  1995年   36680篇
  1994年   33960篇
  1993年   31854篇
  1992年   116139篇
  1991年   112704篇
  1990年   109439篇
  1989年   105977篇
  1988年   97723篇
  1987年   95998篇
  1986年   90780篇
  1985年   87014篇
  1984年   65130篇
  1983年   55667篇
  1982年   32975篇
  1981年   29644篇
  1979年   59687篇
  1978年   41851篇
  1977年   35551篇
  1976年   33156篇
  1975年   35348篇
  1974年   42333篇
  1973年   40373篇
  1972年   37731篇
  1971年   35251篇
  1970年   32468篇
  1969年   31060篇
  1968年   28387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.
Cognitive Therapy and Research - Despite interest in psychological inflexibility as a marker of suicide risk, no measure of psychological inflexibility specific to SI exists. The present study...  相似文献   
26.
27.
28.
29.
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   
30.
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   
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