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   147872篇
  免费   32406篇
  国内免费   2392篇
耳鼻咽喉   5154篇
儿科学   5331篇
妇产科学   2356篇
基础医学   2904篇
口腔科学   1464篇
临床医学   26497篇
内科学   46818篇
皮肤病学   7386篇
神经病学   14611篇
特种医学   6299篇
外科学   40887篇
综合类   237篇
现状与发展   72篇
预防医学   6915篇
眼科学   3313篇
药学   851篇
中国医学   6篇
肿瘤学   11569篇
  2024年   512篇
  2023年   4776篇
  2022年   1153篇
  2021年   3036篇
  2020年   5998篇
  2019年   2116篇
  2018年   7333篇
  2017年   7295篇
  2016年   8375篇
  2015年   8365篇
  2014年   15420篇
  2013年   15532篇
  2012年   5341篇
  2011年   5332篇
  2010年   10275篇
  2009年   14176篇
  2008年   5667篇
  2007年   3896篇
  2006年   6380篇
  2005年   3658篇
  2004年   2935篇
  2003年   1917篇
  2002年   2010篇
  2001年   3783篇
  2000年   2997篇
  1999年   3198篇
  1998年   3633篇
  1997年   3449篇
  1996年   3354篇
  1995年   3202篇
  1994年   1935篇
  1993年   1561篇
  1992年   1376篇
  1991年   1408篇
  1990年   1056篇
  1989年   1186篇
  1988年   1017篇
  1987年   852篇
  1986年   886篇
  1985年   719篇
  1984年   544篇
  1983年   519篇
  1982年   511篇
  1981年   399篇
  1980年   359篇
  1979年   307篇
  1978年   328篇
  1977年   397篇
  1975年   278篇
  1972年   302篇
排序方式: 共有10000条查询结果,搜索用时 164 毫秒
41.
42.
43.
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   
44.
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   
45.
46.
47.
48.
49.

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   
50.
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