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   148690篇
  免费   32500篇
  国内免费   2392篇
耳鼻咽喉   5161篇
儿科学   5377篇
妇产科学   2418篇
基础医学   3086篇
口腔科学   1494篇
临床医学   26540篇
内科学   47081篇
皮肤病学   7403篇
神经病学   14712篇
特种医学   6335篇
外科学   40790篇
综合类   236篇
现状与发展   72篇
预防医学   6959篇
眼科学   3334篇
药学   918篇
中国医学   10篇
肿瘤学   11656篇
  2024年   513篇
  2023年   4790篇
  2022年   1150篇
  2021年   3073篇
  2020年   6021篇
  2019年   2146篇
  2018年   7354篇
  2017年   7328篇
  2016年   8398篇
  2015年   8390篇
  2014年   15462篇
  2013年   15580篇
  2012年   5386篇
  2011年   5390篇
  2010年   10317篇
  2009年   14196篇
  2008年   5726篇
  2007年   3960篇
  2006年   6436篇
  2005年   3733篇
  2004年   2976篇
  2003年   1969篇
  2002年   2036篇
  2001年   3789篇
  2000年   2999篇
  1999年   3202篇
  1998年   3640篇
  1997年   3455篇
  1996年   3362篇
  1995年   3207篇
  1994年   1937篇
  1993年   1565篇
  1992年   1360篇
  1991年   1418篇
  1990年   1060篇
  1989年   1177篇
  1988年   1016篇
  1987年   847篇
  1986年   893篇
  1985年   726篇
  1984年   555篇
  1983年   526篇
  1982年   511篇
  1981年   397篇
  1980年   364篇
  1979年   313篇
  1978年   332篇
  1977年   399篇
  1975年   281篇
  1972年   281篇
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
61.
62.
63.
Breast elastography has been available for more than 15 years but is not widely incorporated into clinical practice. Many publications report extremely high accuracy for various breast elastographic techniques. However, results in the literature are extremely variable. This variability is most likely due to variations in technique, a relatively steep learning curve, and variability in methods between vendors. This article describes our protocol for performing breast elastography using both strain elastography and shear wave elastography, which produces high sensitivity and specificity. Additionally, we will describe the most commonly known false-positive and false-negative lesions as well as how to detect them.  相似文献   
64.
The term “oligometastatic prostate cancer” refers to a heterogeneous group of disease states currently defined solely on the basis of clinical features. Oligorecurrent disease, de novo oligometastases, and oligoprogressive disease likely have unique biologic underpinnings and natural histories. Evidence suggesting the existence of a subset of patients who harbor prostate cancer with limited metastatic potential currently includes disparate and overwhelmingly retrospective reports. Nevertheless, emerging prospective data have corroborated the “better-than-expected,” retrospectively observed outcomes, particularly in the setting of oligorecurrent prostate cancer. Improved functional imaging with prostate-specific membrane antigen-targeted strategies may enhance the identification of patients with oligometastatic prostate cancer in the short term. In the long term, refinement of the oligometastatic case definition likely will require biologic risk-stratification schemes. To determine optimal treatment strategies and identify patients most likely to benefit from metastasis-directed therapy, future efforts should focus on conducting high-quality, prospective trials with much-needed molecular correlative studies.  相似文献   
65.
66.
67.
68.
69.

Objective

To examine the experience of interracial anxiety among health professionals and how it may affect the quality of their interactions with patients from racially marginalized populations. We explored the influence of prior interracial exposure—specifically through childhood neighborhoods, college student bodies, and friend groups—on interracial anxiety among medical students and residents. We also examined whether levels of interracial anxiety change from medical school through residency.

Data Source

Web-based longitudinal survey data from the Medical Student Cognitive Habits and Growth Evaluation Study.

Study Design

We used a retrospective longitudinal design with four observations for each trainee. The study population consisted of non-Black US medical trainees surveyed in their 1st and 4th years of medical school and 2nd and 3rd years of residency. Mixed effects longitudinal models were used to assess predictors of interracial anxiety and assess changes in interracial anxiety scores over time.

Principal Findings

In total, 3155 non-Black medical trainees were followed for 7 years. Seventy-eight percent grew up in predominantly White neighborhoods. Living in predominantly White neighborhoods and having less racially diverse friends were associated with higher levels of interracial anxiety among medical trainees. Trainees' interracial anxiety scores did not substantially change over time; interracial anxiety was highest in the 1st year of medical school, lowest in the 4th year, and increased slightly during residency.

Conclusions

Neighborhood and friend group composition had independent effects on interracial anxiety, indicating that premedical racial socialization may affect medical trainees' preparedness to interact effectively with diverse patient populations. Additionally, the lack of substantial change in interracial anxiety throughout medical training suggests the importance of providing curricular tools and structure (e.g., instituting interracial cooperative learning activities) to foster the development of healthy interracial relationships.  相似文献   
70.
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