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   1259159篇
  免费   99123篇
  国内免费   22985篇
耳鼻咽喉   15018篇
儿科学   36856篇
妇产科学   31557篇
基础医学   177649篇
口腔科学   31952篇
临床医学   127809篇
内科学   231429篇
皮肤病学   25314篇
神经病学   93793篇
特种医学   47882篇
外国民族医学   503篇
外科学   174879篇
综合类   67432篇
现状与发展   74篇
一般理论   411篇
预防医学   93586篇
眼科学   30664篇
药学   99785篇
  302篇
中国医学   17549篇
肿瘤学   76823篇
  2022年   14040篇
  2021年   20829篇
  2020年   14949篇
  2019年   16468篇
  2018年   20121篇
  2017年   16661篇
  2016年   17382篇
  2015年   22664篇
  2014年   29291篇
  2013年   34566篇
  2012年   47349篇
  2011年   52019篇
  2010年   31520篇
  2009年   27548篇
  2008年   41901篇
  2007年   43594篇
  2006年   44403篇
  2005年   43339篇
  2004年   36997篇
  2003年   35328篇
  2002年   33090篇
  2001年   52338篇
  2000年   54207篇
  1999年   47269篇
  1998年   15933篇
  1997年   14887篇
  1996年   13890篇
  1995年   13355篇
  1994年   12030篇
  1993年   10476篇
  1992年   34398篇
  1991年   33233篇
  1990年   32554篇
  1989年   31192篇
  1988年   28304篇
  1987年   28310篇
  1986年   26162篇
  1985年   25187篇
  1984年   18741篇
  1983年   15757篇
  1982年   9427篇
  1979年   16977篇
  1978年   12258篇
  1977年   10359篇
  1976年   9779篇
  1975年   10213篇
  1974年   12350篇
  1973年   11869篇
  1972年   10906篇
  1971年   10137篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
2.
European Archives of Oto-Rhino-Laryngology - Several polymorphisms in a disintegrin and metalloproteinase 33 (ADAM33) have been implicated in susceptibility to allergic rhinitis (AR), but the...  相似文献   
3.
4.
5.
6.
Patients with mechanic ankle instability experience increased tibiotalar and subtalar joint laxity. However, in vivo joint kinematics in functional ankle instability (FAI) patients and lateral ankle sprain (LAS) copers, especially during dynamic activities, are poorly understood. Ten FAI patients, 10 LAS copers, and 10 healthy controls were included in this study. A dual fluoroscopic imaging system was used to analyze the tibiotalar and subtalar joint kinematics during stair descent. Five key poses of stair descent were analyzed. Kinematic data from six degrees of freedom were calculated utilizing a solid modeling software. The range of motion and joint positions in each degree of freedom were compared among the three groups. The tibiotalar joints of FAI patients and LAS copers were significantly more inverted than those of healthy controls during the foot strike (p = 0.016, = 0.264). The subtalar joints of FAI patients were significantly more anteriorly translated (pose 2, p = 0.003, = 0.352; pose 3, p < 0.001, = 0.454; pose 4, p = 0.004, = 0.334), inverted (pose 4, p = 0.027, = 0.234; pose 5,p = 0.034, = 0.221), and externally rotated (pose 4, p = 0.037, = 0.217; pose 5; p = 0.004, = 0.331) than those of healthy controls during the mid‐stance and the heel off. The FAI patients showed excessive tibiotalar inversion and subtalar joint hypermobility during stair descent. Meanwhile, the LAS copers maintained subtalar joint stability, and only showed excessive tibiotalar inversion in foot strike. These data provide insight into the mechanisms behind the development of FAI after initial LAS. © 2019 Orthopaedic Research Society. Published by Wiley Periodicals, Inc. J Orthop Res 37:1860–1867, 2019  相似文献   
7.
8.
9.
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