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   116065篇
  免费   6086篇
  国内免费   137篇
耳鼻咽喉   1782篇
儿科学   5194篇
妇产科学   3943篇
基础医学   16158篇
口腔科学   2826篇
临床医学   8322篇
内科学   21993篇
皮肤病学   3372篇
神经病学   8984篇
特种医学   5064篇
外国民族医学   32篇
外科学   19023篇
综合类   1596篇
一般理论   29篇
预防医学   5794篇
眼科学   3417篇
药学   8055篇
中国医学   323篇
肿瘤学   6381篇
  2018年   888篇
  2017年   778篇
  2016年   1094篇
  2015年   1216篇
  2014年   1601篇
  2013年   2361篇
  2012年   3102篇
  2011年   3152篇
  2010年   1974篇
  2009年   1939篇
  2008年   3262篇
  2007年   3496篇
  2006年   3636篇
  2005年   3760篇
  2004年   3705篇
  2003年   3577篇
  2002年   3525篇
  2001年   7038篇
  2000年   6981篇
  1999年   5883篇
  1998年   1632篇
  1997年   1568篇
  1996年   1340篇
  1995年   1202篇
  1994年   1097篇
  1993年   1124篇
  1992年   3777篇
  1991年   3586篇
  1990年   3566篇
  1989年   3355篇
  1988年   2991篇
  1987年   2904篇
  1986年   2806篇
  1985年   2623篇
  1984年   1951篇
  1983年   1591篇
  1982年   926篇
  1981年   910篇
  1980年   762篇
  1979年   1826篇
  1978年   1340篇
  1977年   1109篇
  1976年   939篇
  1975年   1181篇
  1974年   1213篇
  1973年   1199篇
  1972年   1043篇
  1971年   982篇
  1970年   883篇
  1969年   795篇
排序方式: 共有10000条查询结果,搜索用时 15 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