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   29871篇
  免费   4695篇
  国内免费   264篇
耳鼻咽喉   837篇
儿科学   1009篇
妇产科学   921篇
基础医学   2866篇
口腔科学   698篇
临床医学   3729篇
内科学   5731篇
皮肤病学   753篇
神经病学   3140篇
特种医学   1474篇
外科学   5664篇
综合类   415篇
现状与发展   2篇
一般理论   36篇
预防医学   2862篇
眼科学   698篇
药学   1696篇
中国医学   21篇
肿瘤学   2278篇
  2023年   596篇
  2022年   236篇
  2021年   564篇
  2020年   930篇
  2019年   468篇
  2018年   985篇
  2017年   896篇
  2016年   1048篇
  2015年   1025篇
  2014年   1382篇
  2013年   1675篇
  2012年   1233篇
  2011年   1175篇
  2010年   1181篇
  2009年   1296篇
  2008年   1132篇
  2007年   1030篇
  2006年   1083篇
  2005年   931篇
  2004年   813篇
  2003年   807篇
  2002年   740篇
  2001年   778篇
  2000年   734篇
  1999年   729篇
  1998年   485篇
  1997年   478篇
  1996年   502篇
  1995年   464篇
  1994年   328篇
  1993年   278篇
  1992年   572篇
  1991年   588篇
  1990年   518篇
  1989年   527篇
  1988年   545篇
  1987年   524篇
  1986年   447篇
  1985年   469篇
  1984年   381篇
  1983年   310篇
  1982年   240篇
  1979年   310篇
  1978年   255篇
  1977年   204篇
  1976年   216篇
  1975年   190篇
  1974年   220篇
  1973年   211篇
  1972年   204篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
2.
3.
4.
Background A high Mandard score implies a non-response to chemotherapy in oesophageal adenocarcinoma. However, some patients exhibit tumour volume reduction and a nodal response despite a high score. This study examines survival and recurrence patterns in these patients.Methods Clinicopathological factors were analysed using multivariable Cox regression assessing time to death and recurrence. Computed tomography-estimated tumour volume change was examined in a subgroup of consecutive patients.Results Five hundred and fifty-five patients were included. Median survival was 55 months (Mandard 1–3) and 21 months (Mandard 4 and 5). In the Mandard 4 and 5 group (332 patients), comparison between complete nodal responders and persistent nodal disease showed improved survival (90 vs 18 months), recurrence rates (locoregional 14.75 vs 28.74%, systemic 24.59 vs 48.42%) and circumferential resection margin positivity (22.95 vs 68.11%). Complete nodal response independently predicted improved survival (hazard ratio 0.34 (0.16–0.74). Post-chemotherapy tumour volume reduction was greater in patients with a complete nodal response (−16.3 vs −7.7 cm3, p = 0.033) with no significant difference between Mandard groups.Conclusion Patients with a complete nodal response to chemotherapy have significantly improved outcomes despite a poor Mandard score. High Mandard score does not correspond with a non-response to chemotherapy in all cases and patients with nodal downstaging may still benefit from adjuvant chemotherapy.Subject terms: Oesophageal cancer, Surgical oncology  相似文献   
5.
6.
ABSTRACT

Communication between health professionals and patients is an intergroup phenomenon where the health professional has the most power and status. Over the past few decades, there has been a steady increase in the availability to patients of information about healthcare and specific diseases on the Internet. In this paper, we ask whether the use of Internet health information assists patients to manage their consultations with health professionals better and whether it alters the intergroup dynamic by providing a more equal status for patients. In this study 370 participants from Australia and Canada completed a survey that included a ‘willingness to communicate with health professionals’ scale. They also commented on their use and trust of Internet health information. Thematic analysis suggests that patients’ use of Internet health information serves as a broker between patients and their health provider in health consultations. We discuss the implications of these findings for health practitioners as they address how easier Internet access influences patient interactions with health professionals. We consider future research directions these finding provide in explaining communication behaviour in this context.  相似文献   
7.
Graefe's Archive for Clinical and Experimental Ophthalmology -  相似文献   
8.

Objectives

Iatrogenic injury of the Profunda Femoris Artery (PFA) at time of hip fixation surgery can increase morbidity and mortality and prolong the hospital stay. This is an injury that tends to pass unnoticed as a cause of postoperative deterioration despite being frequently reported in the literature. Our study aims to describe the anatomy of the PFA in relation to the medial femoral cortex with specific emphasis on its orientation relative to the position of a sliding hip screw side plate construct. By doing so we are able to present clear guidance to orthopaedic surgeons on how to avoid iatrogenic PFA injury at the time of hip fracture fixation.

Methods

Using Computed Tomography Angiographic (CTA) studies, the course of the PFA in relation to the medial femoral cortex was traced in 44 patients (28 males and 16 females) with mean age of 65.6 years. Coronal and axial CT sections were cross-linked to specify the position of the PFA at 1?cm intervals.

Results

The course of the artery could be divided into three parts relative to a fixed reference point. Proximal and distal parts of the artery were in a safer position in comparison to the middle part of the artery that was found very close to the femoral cortex and along the coronal axis of the femur (mean angle 2.9° from the femoral coronal axis and 13.8?mm from the medial femoral cortex). Using the commercially available side plate constructs, this part of the artery corresponded to the distal part of the plate (third and fourth holes).

Conclusion

Special attention needs to be practiced by the operating surgeon while drilling into the third and fourth holes of the side plate.  相似文献   
9.
10.
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