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   168923篇
  免费   33300篇
  国内免费   2512篇
耳鼻咽喉   5396篇
儿科学   5645篇
妇产科学   2522篇
基础医学   5589篇
口腔科学   1914篇
临床医学   28030篇
内科学   52276篇
皮肤病学   7728篇
神经病学   16317篇
特种医学   7347篇
外科学   44537篇
综合类   338篇
现状与发展   72篇
一般理论   2篇
预防医学   7496篇
眼科学   3656篇
药学   2025篇
中国医学   36篇
肿瘤学   13809篇
  2024年   700篇
  2023年   4889篇
  2022年   1373篇
  2021年   3402篇
  2020年   6199篇
  2019年   2381篇
  2018年   7703篇
  2017年   7579篇
  2016年   8729篇
  2015年   8756篇
  2014年   15930篇
  2013年   16122篇
  2012年   6246篇
  2011年   6428篇
  2010年   10890篇
  2009年   14695篇
  2008年   6574篇
  2007年   4903篇
  2006年   7351篇
  2005年   4662篇
  2004年   3918篇
  2003年   2915篇
  2002年   2924篇
  2001年   4418篇
  2000年   3654篇
  1999年   3819篇
  1998年   3919篇
  1997年   3673篇
  1996年   3544篇
  1995年   3383篇
  1994年   2109篇
  1993年   1697篇
  1992年   1875篇
  1991年   1781篇
  1990年   1474篇
  1989年   1580篇
  1988年   1400篇
  1987年   1201篇
  1986年   1220篇
  1985年   1075篇
  1984年   764篇
  1983年   729篇
  1982年   611篇
  1981年   461篇
  1980年   434篇
  1979年   481篇
  1978年   434篇
  1977年   510篇
  1975年   368篇
  1972年   375篇
排序方式: 共有10000条查询结果,搜索用时 796 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.

Background

There were few studies assessed the postoperative sarcopenia in patients with cancers. The objective of present study was to assess whether postoperative development of sarcopenia could predict a poor prognosis in patients with adenocarcinoma of esophagogastric junction, (AEG) and upper gastric cancer (UGC).

Methods

Patients with AEG and UGC who were judged as non-sarcopenic before surgery were reassessed the presence of postoperative development of sarcopenia 6 months after surgery. Patients were divided into the development group or non-development group, and clinicopathological factors and prognosis between these two groups were analyzed.

Results

The 5-year overall survival rates were significantly poorer in the development group than non-development group (68.0% vs. 92.6%, P?=?0.0118). Multivariate analyses showed that postoperative development of sarcopenia was an independent prognostic factor for poor overall survival (P?=?0.0237).

Conclusions

Postoperative development of sarcopenia was associated with a poor prognosis in patients with AEG and UGC.  相似文献   
46.
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   
47.
48.
49.
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