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   22609篇
  免费   1148篇
  国内免费   129篇
耳鼻咽喉   276篇
儿科学   447篇
妇产科学   503篇
基础医学   2998篇
口腔科学   1731篇
临床医学   1665篇
内科学   5701篇
皮肤病学   573篇
神经病学   1957篇
特种医学   529篇
外科学   3053篇
综合类   85篇
一般理论   5篇
预防医学   1484篇
眼科学   413篇
药学   1130篇
中国医学   109篇
肿瘤学   1227篇
  2024年   17篇
  2023年   159篇
  2022年   399篇
  2021年   755篇
  2020年   421篇
  2019年   529篇
  2018年   762篇
  2017年   430篇
  2016年   576篇
  2015年   697篇
  2014年   979篇
  2013年   1128篇
  2012年   1839篇
  2011年   1990篇
  2010年   1090篇
  2009年   973篇
  2008年   1635篇
  2007年   1663篇
  2006年   1519篇
  2005年   1305篇
  2004年   1198篇
  2003年   1021篇
  2002年   989篇
  2001年   130篇
  2000年   116篇
  1999年   145篇
  1998年   143篇
  1997年   133篇
  1996年   115篇
  1995年   98篇
  1994年   95篇
  1993年   82篇
  1992年   80篇
  1991年   79篇
  1990年   63篇
  1989年   56篇
  1988年   41篇
  1987年   32篇
  1986年   40篇
  1985年   30篇
  1984年   44篇
  1983年   43篇
  1982年   26篇
  1981年   26篇
  1980年   26篇
  1979年   16篇
  1978年   18篇
  1977年   26篇
  1974年   15篇
  1973年   13篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
11.
Quality of Life Research - This study investigated the PROMIS Self-Efficacy Measure for Managing Chronic Conditions (PROMIS-SE) domain distributions and examined the factor structure of the...  相似文献   
12.
13.
14.
A patient with HIV infection developed the first episode of AIDS-defining opportunism (severe Candida albicans esophagitis) with an underlying CD4+ lymphocyte count of 1,025 cells/microL. After treatment with a highly active antiretroviral therapy (HAART), taken with insufficient compliance and leaving a residual viral load, our patient suffered from two relapses of esophageal candidiasis, which occurred three months and seven years later, when his CD4+ lymphocyte count was 930 and 439 cells/microL, respectively, and a viral load slightly above 10(4) copies/mL was still present. Also in the HAART era, Candida esophagitis remains one of the most common AIDS-defining diseases, but a presentation with a concurrent CD4+ count above 1,000 cells/microL remains a rare exception, as well as the two isolated, subsequent relapses, occurred with a CD4+ count ranging from 439 to 930 cells/microL, and a residual HIV viremia due to insufficient adherence to the prescribed HAART regimens. Our case report represents the opportunity to revisit the epidemiology and, especially, the pathogenesis of this opportunistic fungal complication in HIV-infected patients and in other subjects at risk, on the ground of an extensive literature review, and to explore possible alternative supporting factors other than the crude absolute CD4+ lymphocyte count, with emphasis on the possible role of a persisting HIV viremia, and other potential contributing factors. Clinicians engaged with immunocompromised patients and subjects with HIV disease, should be aware that a Candida esophagitis may occur and relapse also when the cell-mediated immunity, as measured by a simple CD4+ cell count, do not show relevant abnormalities.  相似文献   
15.
16.
Preventable trauma deaths are defined as deaths which could be avoided if optimal care has been delivered. Studies on preventable trauma deaths have been accomplished initially with panel reviews of pre-hospital and hospital charts. However, several investigators questioned the reliability and validity of this method because of low reproducibility of implicit judgments when they are made by different experts. Nevertheless, number of studies were published all around the world and ultimately gained some credibility, particularly in regions where comparisons were made before and after trauma system implementation with a resultant fall in mortality. During the last decade of century the method of comparing observed survival with probability of survival calculated from large trauma registries has obtained popularity. Preventable trauma deaths were identified as deaths occurred notwithstanding a high calculated probability of survival. In recent years, preventable trauma deaths studies have been replaced by population-based studies, which use databases representative of overall population, therefore with high epidemiologic value. These databases contain readily available information which carry out the advantage of objectivity and large numbers. Nowadays, population-based researches provide the strongest evidence regarding the effectiveness of trauma systems and trauma centers on patient outcomes.  相似文献   
17.

Introduction  

This paper presents the results of a study on the psychometric properties of an authorized Spanish version of the McMaster Family Assessment Device, a self-report measure of family functioning.  相似文献   
18.
19.
20.
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