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   171073篇
  免费   9357篇
  国内免费   178篇
耳鼻咽喉   2626篇
儿科学   6840篇
妇产科学   5225篇
基础医学   24397篇
口腔科学   4912篇
临床医学   13536篇
内科学   31848篇
皮肤病学   4700篇
神经病学   14992篇
特种医学   7569篇
外国民族医学   32篇
外科学   26701篇
综合类   1792篇
一般理论   60篇
预防医学   9450篇
眼科学   4516篇
药学   11744篇
中国医学   400篇
肿瘤学   9268篇
  2021年   1030篇
  2019年   1212篇
  2018年   2143篇
  2017年   1855篇
  2016年   2472篇
  2015年   2313篇
  2014年   2876篇
  2013年   4732篇
  2012年   6089篇
  2011年   6566篇
  2010年   3751篇
  2009年   3053篇
  2008年   6635篇
  2007年   7033篇
  2006年   6924篇
  2005年   6965篇
  2004年   6768篇
  2003年   6690篇
  2002年   6564篇
  2001年   9258篇
  2000年   9836篇
  1999年   7378篇
  1998年   2118篇
  1997年   1999篇
  1996年   1646篇
  1995年   1471篇
  1994年   1374篇
  1993年   1393篇
  1992年   4012篇
  1991年   3784篇
  1990年   3767篇
  1989年   3608篇
  1988年   3180篇
  1987年   3091篇
  1986年   3006篇
  1985年   2874篇
  1984年   2231篇
  1983年   1831篇
  1982年   1160篇
  1981年   1118篇
  1979年   2046篇
  1978年   1507篇
  1977年   1290篇
  1976年   1111篇
  1975年   1332篇
  1974年   1344篇
  1973年   1363篇
  1972年   1140篇
  1971年   1062篇
  1970年   968篇
排序方式: 共有10000条查询结果,搜索用时 598 毫秒
31.
32.
Background: Before implementation of the new scale, the Swedish modified version of the Postural Assessment Scale for Stroke Patients (SwePASS), to clinical practice, it is fundamental to analyze its measurement properties.Objective: To examine the inter-rater reliability of the SwePASS in the acute phase after stroke.

Methods: Day 3 to day 7 after admission to a stroke unit, 64 persons with stroke were assessed twice, using the SwePASS, by two physiotherapists. Inter-rater reliability was determined using percentage-agreement and the rank-invariant method: relative position, relative concentration, and relative rank variance.

Results: The raters showed a percentage agreement of ≥75% in the assessments using the SwePASS. For 9 of the 12 items, the percentage agreement was >80%. For 8 of the 12 items, there was a statistically significant change in position, revealed in relative position values between 0.08 and 0.15. Three items had statistically significant positive relative concentration values between ?0.11 and 0.10. Except for a statistically significant negligible relative variance value of 0.01 for the items 1 and 8, there was no relative variance.

Conclusions: The SwePASS shows an acceptable inter-rater reliability, albeit with potential for improvement. The reliability can be improved by a consensus how to interpret the scale between the raters prior to implementation in the clinic.  相似文献   

33.
Objectives: There is a paucity of reporting on surgical outcomes of isolated posterior cruciate ligament reconstruction (PCLR). We hypothesize that isolated PCL injuries failing nonoperative treatment achieve good outcomes and are able to return to sport following PCLR.

Methods: A retrospective analysis was performed to identify patients with isolated PCL injuries that underwent reconstruction between 2001 and 2014. Patients with multi-ligamentous injury or another concomitant knee pathology were excluded. Medical records were reviewed for demographic, clinical and operative data. Patients were contacted for administration of a telephone-based questionnaire which included the International Knee Documentation Committee (IKDC) Subjective Knee Evaluation form, Lysholm-Tegner scales, Marx activity scale (MAS), return to sport status, and patient satisfaction instruments.

Results: A total of 15 isolated PCL reconstructions in 14 patients with a mean age of 27.5 years (range 17–43) met the study inclusion criteria; mean follow up was 6.3 years (range 1.4–15.2). Pre-operatively, the primary complaint was knee instability in all patients; on physical examination, lack of a firm end point during posterior drawer testing was found in 93% (14/15) of the knees. In total, 12 of 15 knees underwent transtibial, single-bundle PCLR and three of 15 underwent tibial inlay, double bundle PCLR. Graft types included: quadriceps autograft (7/15), Achilles allograft (6/15), and hamstring autograft (2/15). There were no graft failures in our patient cohort. At most recent follow up the mean scores respectively on the IKDC form, Lysholm-Tegner scales and MAS were (standard deviation): 77.3 (16.5), 83.1 (17.9), 6.13 (2.6), and 7.1 (6.0). All fourteen patients were athletes prior to their injury and 79% (11/14) returned to sport and overall patient satisfaction was 9.2/10.

Conclusions: Isolated PCLR provides good outcomes at mean medium-term follow up with restoration of function, high rate of return to sport and overall patient satisfaction.  相似文献   

34.
35.
36.
37.
38.
39.
Abstract

The leading cause of death of adolescents in developed countries is injury. Alcohol is a major contributor to adolescent injury. Most of the injury deaths in youth are caused by traffic crashes. Driving under the influence (DUI) and riding with a driver who is under the influence (RUI) of alcohol increase the risk of road crash. The focus of this study is how adolescents’ risk of DUI and RUI differ in relation to their experience of parental control and peer pressure to substance use, other risky behaviours and leisure time activities. The analyses are based on data from the European School Survey Project on Alcohol and Other Drugs collected from 15- to 16-year-old Finnish adolescents in 2015 (n?=?4049, response rate 88.7%). The study shows that problems tend to entangle in some adolescent groups in which DUI and RUI are also more common. Adolescents with higher probability of using various substances, of starting alcohol use at young age, of experiencing weak parental control, and high peer pressure are at higher risk of DUI and RUI. The results indicate that professionals and authorities handling underage DUI and RUI ought to consider adolescents’ situation as a whole.  相似文献   
40.
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