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   116263篇
  免费   6087篇
  国内免费   137篇
耳鼻咽喉   1774篇
儿科学   5214篇
妇产科学   3939篇
基础医学   16186篇
口腔科学   2832篇
临床医学   8323篇
内科学   22014篇
皮肤病学   3356篇
神经病学   9020篇
特种医学   5092篇
外国民族医学   32篇
外科学   19071篇
综合类   1589篇
一般理论   29篇
预防医学   5801篇
眼科学   3458篇
药学   8056篇
中国医学   322篇
肿瘤学   6379篇
  2018年   892篇
  2017年   780篇
  2016年   1104篇
  2015年   1230篇
  2014年   1615篇
  2013年   2374篇
  2012年   3122篇
  2011年   3171篇
  2010年   1983篇
  2009年   1938篇
  2008年   3278篇
  2007年   3515篇
  2006年   3670篇
  2005年   3765篇
  2004年   3716篇
  2003年   3577篇
  2002年   3538篇
  2001年   7053篇
  2000年   6986篇
  1999年   5895篇
  1998年   1638篇
  1997年   1565篇
  1996年   1304篇
  1995年   1209篇
  1994年   1093篇
  1993年   1120篇
  1992年   3773篇
  1991年   3581篇
  1990年   3569篇
  1989年   3357篇
  1988年   2990篇
  1987年   2900篇
  1986年   2806篇
  1985年   2622篇
  1984年   1945篇
  1983年   1592篇
  1982年   925篇
  1981年   912篇
  1980年   762篇
  1979年   1824篇
  1978年   1343篇
  1977年   1105篇
  1976年   931篇
  1975年   1182篇
  1974年   1213篇
  1973年   1195篇
  1972年   1045篇
  1971年   979篇
  1970年   880篇
  1969年   788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