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   273651篇
  免费   6871篇
  国内免费   1213篇
耳鼻咽喉   2223篇
儿科学   9179篇
妇产科学   4889篇
基础医学   31668篇
口腔科学   3365篇
临床医学   20286篇
内科学   49743篇
皮肤病学   2099篇
神经病学   24182篇
特种医学   12310篇
外国民族医学   4篇
外科学   44790篇
综合类   6141篇
一般理论   33篇
预防医学   24691篇
眼科学   5049篇
药学   16753篇
  1篇
中国医学   1155篇
肿瘤学   23174篇
  2023年   364篇
  2022年   648篇
  2021年   1334篇
  2020年   832篇
  2019年   1248篇
  2018年   25670篇
  2017年   20572篇
  2016年   23932篇
  2015年   2570篇
  2014年   2917篇
  2013年   3336篇
  2012年   11035篇
  2011年   26665篇
  2010年   22398篇
  2009年   14791篇
  2008年   25947篇
  2007年   29739篇
  2006年   3676篇
  2005年   5920篇
  2004年   7376篇
  2003年   8993篇
  2002年   6297篇
  2001年   4065篇
  2000年   4205篇
  1999年   3151篇
  1998年   1352篇
  1997年   1128篇
  1996年   785篇
  1995年   743篇
  1994年   705篇
  1993年   609篇
  1992年   1799篇
  1991年   1672篇
  1990年   1572篇
  1989年   1534篇
  1988年   1395篇
  1987年   1327篇
  1986年   1227篇
  1985年   1158篇
  1984年   770篇
  1983年   670篇
  1982年   490篇
  1981年   299篇
  1980年   395篇
  1979年   546篇
  1978年   314篇
  1977年   244篇
  1976年   271篇
  1974年   257篇
  1973年   236篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
41.
42.

Objective

The teaching hospital of Nancy, France, implemented a specific multidisciplinary care pathway (French acronym AMDPL) to improve the management of patients presenting with Lyme borreliosis (LB) suspicion. We aimed to assess the first year of activity of this care pathway.

Patients and methods

We included all patients managed in the AMDPL pathway from November 1, 2016 to October 31, 2017. The first step was a dedicated Lyme disease consultation with an infectious disease specialist. Following this consultation, the LB diagnosis was either confirmed and adequate treatment was prescribed, or a differential diagnosis was established and patients received adequate management, or further investigations were required and patients were offered multidisciplinary management as part of a day hospitalization.

Results

A total of 468 patients were included. LB diagnosis was confirmed in 15% of patients (69/468), 49% of patients received a differential diagnosis, and 26% (122/468) of patients had the LB diagnosis ruled out without receiving any other diagnosis.

Conclusions

This is to our knowledge the first multidisciplinary center implemented in France for the management of patients presenting with LB suspicion related to polymorphous signs and symptoms. Several diagnoses could be confirmed or corrected, although some symptoms and complaints could not be explained. This cohort could improve our knowledge of LB and its differential diagnoses.  相似文献   
43.
44.
45.
46.
47.
48.
49.
Partial nephrectomy is the mainstay of treatment for localized kidney cancer. A proportion of patients are upstaged post-operatively to locally advanced di  相似文献   
50.

Background

The purpose of this analysis is to describe the differences in cardiac magnetic resonance characteristics between benign and malignant tumors, which would be helpful for surgical planning.

Methods

This was a prospective cohort study of 130 patients who underwent cardiac magnetic resonance imaging for evaluation of a suspected cardiac mass. After excluding thrombi and tumors without definitive diagnosis, 66 tumors were evaluated for morphologic features and tissue composition.

Results

Of the 66 patients, 39 (59.0%) had malignant tumors and 27 (41.0%) had benign tumors. Patients with malignant tumors were younger when compared with those with benign tumors (age 51 years [42.8-60.0] vs 65 years [60.0-71.0] median). Malignant tumors more often demonstrated tumor invasion (69% vs 0% P < .001) and were more often associated with pericardial effusion (41% vs 7.4% P = .004). Presence of first-pass perfusion (100% vs 33% P < .001) and late gadolinium enhancement (100% vs 59.2%, P < .001) were significantly higher in malignant tumors. In logistic regression modeling, tumor invasion (P < .001) and first-pass perfusion (P < .001) were independently associated with malignancy. Furthermore, using classification and regression tree analysis, we developed a decision tree algorithm to help differentiate benign from malignant tumors (diagnostic accuracy ~90%). The algorithm-weighted cost of misclassifying a malignant tumor as benign was twice that of classifying a benign tumor as malignant.

Conclusions

Our study demonstrates that cardiac magnetic resonance imaging is a useful noninvasive method for differentiating malignant from benign cardiac tumors. Tumor size, invasion, and first-pass perfusion were useful imaging characteristics in differentiating benign from malignant tumors.  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