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   115885篇
  免费   6068篇
  国内免费   135篇
耳鼻咽喉   1775篇
儿科学   5206篇
妇产科学   3938篇
基础医学   16060篇
口腔科学   2826篇
临床医学   8290篇
内科学   21918篇
皮肤病学   3362篇
神经病学   8974篇
特种医学   5058篇
外国民族医学   32篇
外科学   19007篇
综合类   1591篇
一般理论   29篇
预防医学   5800篇
眼科学   3387篇
药学   8051篇
中国医学   322篇
肿瘤学   6462篇
  2018年   896篇
  2017年   782篇
  2016年   1093篇
  2015年   1223篇
  2014年   1606篇
  2013年   2374篇
  2012年   3116篇
  2011年   3160篇
  2010年   1974篇
  2009年   1938篇
  2008年   3264篇
  2007年   3501篇
  2006年   3644篇
  2005年   3758篇
  2004年   3702篇
  2003年   3575篇
  2002年   3524篇
  2001年   7023篇
  2000年   6964篇
  1999年   5863篇
  1998年   1626篇
  1997年   1562篇
  1996年   1301篇
  1995年   1199篇
  1994年   1089篇
  1993年   1119篇
  1992年   3776篇
  1991年   3581篇
  1990年   3566篇
  1989年   3347篇
  1988年   2986篇
  1987年   2897篇
  1986年   2805篇
  1985年   2622篇
  1984年   1945篇
  1983年   1592篇
  1982年   923篇
  1981年   908篇
  1980年   762篇
  1979年   1821篇
  1978年   1341篇
  1977年   1105篇
  1976年   930篇
  1975年   1179篇
  1974年   1210篇
  1973年   1193篇
  1972年   1038篇
  1971年   975篇
  1970年   879篇
  1969年   788篇
排序方式: 共有10000条查询结果,搜索用时 62 毫秒
1.
2.
The UK has low breastfeeding rates, with socioeconomic disparities. The Assets‐based feeding help Before and After birth (ABA) intervention was designed to be inclusive and improve infant feeding behaviours. ABA is underpinned by the behaviour change wheel and offers an assets‐based approach focusing on positive capabilities of individuals and communities, including use of a Genogram. This study aimed to investigate feasibility of intervention delivery within a randomised controlled trial (RCT). Nulliparous women ≥16 years, (n = 103) from two English sites were recruited and randomised to either intervention or usual care. The intervention – delivered through face‐to‐face, telephone and text message by trained Infant Feeding Helpers (IFHs) – ran from 30‐weeks' gestation until 5‐months postnatal. Outcomes included recruitment rates and follow‐up at 3‐days, 8‐weeks and 6‐months postnatal, with collection of future full trial outcomes via questionnaires. A mixed‐methods process evaluation included qualitative interviews with 30 women, 13 IFHs and 17 maternity providers; IFH contact logs; and fidelity checking of antenatal contact recordings. This study successfully recruited women, including teenagers, from socioeconomically disadvantaged areas; postnatal follow‐up rates were 68.0%, 85.4% and 80.6% at 3‐days, 8‐weeks and 6‐months respectively. Breastfeeding at 8‐weeks was obtained for 95.1% using routine data for non‐responders. It was possible to recruit and train peer supporters to deliver the intervention with adequate fidelity. The ABA intervention was acceptable to women, IFHs and maternity services. There was minimal contamination and no evidence of intervention‐related harm. In conclusion, the intervention is feasible to deliver within an RCT, and a definitive trial required.  相似文献   
3.
4.
5.
6.
7.
8.
9.
Hillermann  T.  Homburg  K.  Rainer  M.  Budde  U. 《Der Anaesthesist》2022,71(4):299-302
Die Anaesthesiologie - Eine junge Patientin erleidet während der Anlage einer axillären Plexusblockade einen generalisierten Krampfanfall. Die Mechanismen, im Wesentlichen die vermutlich...  相似文献   
10.

Objective

Low psoas muscle area is shown to be an indicator for worse postoperative outcome in patients undergoing vascular surgical. Additionally, it has been associated with longer durations of hospital stay in patients with cancer who undergo surgery and subsequently greater health care costs in Europe and the United States. We sought to evaluate this effect on hospital expenditure for patients undergoing vascular repair in a health care system with universal access.

Methods

Skeletal muscle mass was assessed on preoperative abdominal computed tomography scans of patients undergoing open aortic aneurysm repair in a retrospective fashion. The skeletal muscle index (SMI) was used to define low muscle mass. Health care costs were obtained for all patients and the relationship between a low SMI and higher costs was explored using linear regression and cross-sectional analysis.

Results

We included 156 patients (81.5% male) with a median age of 72 years undergoing elective surgery for infrarenal abdominal aortic aneurysm in this analysis. The median SMI for patients with low skeletal muscle mass was 53.21 cm2/kg and for patients without, 70.07 cm2/kg. Hospital duration of stay was 2 days longer in patients with low skeletal muscle mass as compared with patients with normal (14 days vs 11 days; P = .001), as was duration of intensive care stay (3 days vs 1 day; P = .01). The median overall hospital costs were €10,460 higher for patients with a low SMI as compared with patients with a normal physical constitution (€53,739 [interquartile range, €45,007-€62,471] vs €43,279 [interquartile range, €39,509-€47,049]; P = .001). After confounder adjustment, a low SMI was associated with a 14.68% cost increase in overall hospital costs, for a cost increase of €6521.

Conclusions

Low skeletal muscle mass is independently associated with higher hospital as well as intensive care costs in patients undergoing elective aortic aneurysm repair. Strategies to reduce this risk factor are warranted for these patients.  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