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   1288346篇
  免费   78088篇
  国内免费   1505篇
耳鼻咽喉   16538篇
儿科学   41941篇
妇产科学   32460篇
基础医学   175462篇
口腔科学   31877篇
临床医学   112157篇
内科学   242005篇
皮肤病学   25788篇
神经病学   101240篇
特种医学   53307篇
外国民族医学   201篇
外科学   198529篇
综合类   24656篇
现状与发展   1篇
一般理论   327篇
预防医学   96712篇
眼科学   28293篇
药学   98619篇
  8篇
中国医学   3481篇
肿瘤学   84337篇
  2021年   8614篇
  2019年   8753篇
  2018年   33095篇
  2017年   26026篇
  2016年   29322篇
  2015年   13196篇
  2014年   17541篇
  2013年   25129篇
  2012年   40449篇
  2011年   55562篇
  2010年   38427篇
  2009年   30366篇
  2008年   51330篇
  2007年   55775篇
  2006年   36367篇
  2005年   36157篇
  2004年   35764篇
  2003年   35417篇
  2002年   32455篇
  2001年   61005篇
  2000年   62564篇
  1999年   51777篇
  1998年   13216篇
  1997年   11645篇
  1996年   11513篇
  1995年   10892篇
  1994年   9834篇
  1993年   9283篇
  1992年   38290篇
  1991年   36779篇
  1990年   36285篇
  1989年   34763篇
  1988年   31290篇
  1987年   30345篇
  1986年   28570篇
  1985年   26828篇
  1984年   19514篇
  1983年   16399篇
  1982年   9075篇
  1979年   17254篇
  1978年   11627篇
  1977年   10402篇
  1976年   9019篇
  1975年   10230篇
  1974年   11859篇
  1973年   11453篇
  1972年   10921篇
  1971年   10239篇
  1970年   9432篇
  1969年   9103篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
2.
Quality of Life Research - The COVID-19 pandemic might add to the stressors experienced by people living with rheumatic diseases. This study aimed to examine rheumatic patients’ functional...  相似文献   
3.
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   
4.
5.
6.
7.
8.
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   
9.
10.
Patient navigation is a strategy for overcoming barriers to reduce disparities and to improve access and outcomes. The aim of this umbrella review was to identify, critically appraise, synthesize, and present the best available evidence to inform policy and planning regarding patient navigation across the cancer continuum. Systematic reviews examining navigation in cancer care were identified in the Cochrane Central Register of Controlled Trials (CENTRAL), PubMed, Embase, Cumulative Index of Nursing and Allied Health (CINAHL), Epistemonikos, and Prospective Register of Systematic Reviews (PROSPERO) databases and in the gray literature from January 1, 2012, to April 19, 2022. Data were screened, extracted, and appraised independently by two authors. The JBI Critical Appraisal Checklist for Systematic Review and Research Syntheses was used for quality appraisal. Emerging literature up to May 25, 2022, was also explored to capture primary research published beyond the coverage of included systematic reviews. Of the 2062 unique records identified, 61 systematic reviews were included. Fifty-four reviews were quantitative or mixed-methods reviews, reporting on the effectiveness of cancer patient navigation, including 12 reviews reporting costs or cost-effectiveness outcomes. Seven qualitative reviews explored navigation needs, barriers, and experiences. In addition, 53 primary studies published since 2021 were included. Patient navigation is effective in improving participation in cancer screening and reducing the time from screening to diagnosis and from diagnosis to treatment initiation. Emerging evidence suggests that patient navigation improves quality of life and patient satisfaction with care in the survivorship phase and reduces hospital readmission in the active treatment and survivorship care phases. Palliative care data were extremely limited. Economic evaluations from the United States suggest the potential cost-effectiveness of navigation in screening programs.  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