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   157331篇
  免费   32882篇
  国内免费   2414篇
耳鼻咽喉   5266篇
儿科学   5625篇
妇产科学   2547篇
基础医学   4100篇
口腔科学   1736篇
临床医学   27431篇
内科学   48658篇
皮肤病学   7474篇
神经病学   15644篇
特种医学   6565篇
外科学   42007篇
综合类   275篇
现状与发展   72篇
一般理论   6篇
预防医学   7698篇
眼科学   3498篇
药学   1602篇
中国医学   27篇
肿瘤学   12396篇
  2024年   518篇
  2023年   4806篇
  2022年   1222篇
  2021年   3166篇
  2020年   6126篇
  2019年   2294篇
  2018年   7546篇
  2017年   7468篇
  2016年   8558篇
  2015年   8566篇
  2014年   15692篇
  2013年   16033篇
  2012年   5960篇
  2011年   5980篇
  2010年   10634篇
  2009年   14508篇
  2008年   6281篇
  2007年   4500篇
  2006年   6993篇
  2005年   4239篇
  2004年   3473篇
  2003年   2439篇
  2002年   2511篇
  2001年   3874篇
  2000年   3044篇
  1999年   3287篇
  1998年   3744篇
  1997年   3553篇
  1996年   3448篇
  1995年   3306篇
  1994年   2021篇
  1993年   1646篇
  1992年   1437篇
  1991年   1485篇
  1990年   1108篇
  1989年   1232篇
  1988年   1061篇
  1987年   893篇
  1986年   926篇
  1985年   777篇
  1984年   622篇
  1983年   571篇
  1982年   593篇
  1981年   470篇
  1980年   396篇
  1979年   335篇
  1978年   365篇
  1977年   447篇
  1975年   310篇
  1972年   321篇
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
41.
42.
43.
44.
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   
45.
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   
46.
47.
48.
49.
50.

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   
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