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   1444747篇
  免费   100698篇
  国内免费   2377篇
耳鼻咽喉   20296篇
儿科学   47649篇
妇产科学   41922篇
基础医学   211782篇
口腔科学   40546篇
临床医学   118334篇
内科学   287317篇
皮肤病学   31100篇
神经病学   112785篇
特种医学   55865篇
外国民族医学   367篇
外科学   218617篇
综合类   27410篇
现状与发展   2篇
一般理论   323篇
预防医学   110420篇
眼科学   33414篇
药学   110733篇
  1篇
中国医学   3163篇
肿瘤学   75776篇
  2018年   17899篇
  2017年   13441篇
  2016年   14008篇
  2015年   15382篇
  2014年   19952篇
  2013年   30041篇
  2012年   44478篇
  2011年   46677篇
  2010年   26270篇
  2009年   23900篇
  2008年   43209篇
  2007年   46710篇
  2006年   47020篇
  2005年   49989篇
  2004年   49636篇
  2003年   45975篇
  2002年   41584篇
  2001年   62108篇
  2000年   63913篇
  1999年   54028篇
  1998年   14889篇
  1997年   13253篇
  1996年   13486篇
  1995年   12712篇
  1994年   12065篇
  1992年   42796篇
  1991年   41947篇
  1990年   41492篇
  1989年   40050篇
  1988年   37404篇
  1987年   36541篇
  1986年   34944篇
  1985年   33252篇
  1984年   24740篇
  1983年   21497篇
  1982年   12750篇
  1981年   11262篇
  1979年   23630篇
  1978年   16542篇
  1977年   14391篇
  1976年   13599篇
  1975年   14956篇
  1974年   17590篇
  1973年   17041篇
  1972年   16236篇
  1971年   15136篇
  1970年   14054篇
  1969年   13646篇
  1968年   12908篇
  1967年   11292篇
排序方式: 共有10000条查询结果,搜索用时 406 毫秒
1.
Molnár  B.  Aroca  S.  Dobos  A.  Orbán  K.  Szabó  J.  Windisch  P.  Stähli  A.  Sculean  A. 《Clinical oral investigations》2022,26(12):7135-7142
Clinical Oral Investigations - To evaluate t he long-term outcomes following treatment of RT 1 multiple adjacent gingival recessions (MAGR) using the modified coronally advanced tunnel (MCAT) with...  相似文献   
2.
3.
4.
5.
6.
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   
7.
Journal of Immigrant and Minority Health - COVID-19 has disproportionally affected underrepresented minorities (URM) and low-income immigrants in the United States. The aim of the study is to...  相似文献   
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.
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