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   2585391篇
  免费   185905篇
  国内免费   3932篇
耳鼻咽喉   36625篇
儿科学   86291篇
妇产科学   74257篇
基础医学   379936篇
口腔科学   73222篇
临床医学   229503篇
内科学   497390篇
皮肤病学   55788篇
神经病学   206000篇
特种医学   100639篇
外国民族医学   656篇
外科学   388594篇
综合类   54282篇
现状与发展   5篇
一般理论   989篇
预防医学   198747篇
眼科学   59981篇
药学   192381篇
  7篇
中国医学   4875篇
肿瘤学   135060篇
  2018年   27061篇
  2017年   20767篇
  2016年   23551篇
  2015年   26978篇
  2014年   36611篇
  2013年   55824篇
  2012年   75961篇
  2011年   80367篇
  2010年   47593篇
  2009年   44748篇
  2008年   76661篇
  2007年   82770篇
  2006年   83094篇
  2005年   81484篇
  2004年   78245篇
  2003年   75547篇
  2002年   73706篇
  2001年   111315篇
  2000年   114000篇
  1999年   96528篇
  1998年   27937篇
  1997年   24990篇
  1996年   25075篇
  1995年   23740篇
  1994年   22382篇
  1992年   76279篇
  1991年   75428篇
  1990年   73945篇
  1989年   71762篇
  1988年   66702篇
  1987年   65397篇
  1986年   62450篇
  1985年   59568篇
  1984年   44844篇
  1983年   38945篇
  1982年   23380篇
  1981年   21024篇
  1979年   43099篇
  1978年   30930篇
  1977年   26382篇
  1976年   24652篇
  1975年   27097篇
  1974年   32379篇
  1973年   31564篇
  1972年   29976篇
  1971年   27967篇
  1970年   26290篇
  1969年   24993篇
  1968年   23468篇
  1967年   21023篇
排序方式: 共有10000条查询结果,搜索用时 46 毫秒
51.
52.
53.
54.

Objective

Comparative survival between neoadjuvant chemotherapy and adjuvant chemotherapy for patients with cT2-4N0-1M0 non–small cell lung cancer has not been extensively studied.

Methods

Patients with cT2-4N0-1M0 non–small cell lung cancer who received platinum-based chemotherapy were retrospectively identified. Exclusion criteria included stage IV disease, induction radiotherapy, and targeted therapy. The primary end point was disease-free survival. Secondary end points were overall survival, chemotherapy tolerance, and ability of Response Evaluation Criteria In Solid Tumors response to predict survival. Survival was estimated using the Kaplan–Meier method, compared using the log-rank test and Cox proportional hazards models, and stratified using matched pairs after propensity score matching.

Results

In total, 330 patients met the inclusion criteria (n = 92/group after propensity-score matching; median follow-up, 42 months). Five-year disease-free survival was 49% (95% confidence interval, 39-61) for neoadjuvant chemotherapy versus 48% (95% confidence interval, 38-61) for adjuvant chemotherapy (P = .70). On multivariable analysis, disease-free survival was not associated with neoadjuvant chemotherapy or adjuvant chemotherapy (hazard ratio, 1.1; 95% confidence interval, 0.64-1.90; P = .737), nor was overall survival (hazard ratio, 1.21; 95% confidence interval, 0.63-2.30; P = .572). The neoadjuvant chemotherapy group was more likely to receive full doses and cycles of chemotherapy (P = .014/0.005) and had fewer grade 3 or greater toxicities (P = .001). Response Evaluation Criteria In Solid Tumors response to neoadjuvant chemotherapy was associated with disease-free survival (P = .035); 15% of patients receiving neoadjuvant chemotherapy (14/92) had a major pathologic response.

Conclusions

Timing of chemotherapy, before or after surgery, is not associated with an improvement in overall or disease-free survival among patients with cT2-4N0-1M0 non–small cell lung cancer who undergo complete surgical resection.  相似文献   
55.
56.

Introduction

Several studies demonstrated that simulator-acquired skill transfer to the operating room is incomplete. Our objective was to identify trainee characteristics that predict the transfer of simulator-acquired skill to the operating room.

Methods

Trainees completed baseline assessments including intracorporeal suturing (IS) performance, attentional selectivity, self-reported use of mental skills, and self-reported prior clinical and simulated laparoscopic experience and confidence. Residents then followed proficiency-based laparoscopic skills training, and their skill transfer was assessed on a live-anesthetized porcine model. Predictive characteristics for transfer test performance were assessed using multiple linear regression.

Results

Thirty-eight residents completed the study. Automaticity, attentional selectivity, resident perceived ability with laparoscopy and simulators, and post-training IS performance were predictive of IS performance during the transfer test.

Conclusions

Promoting automaticity, self-efficacy, and attention selectivity may help improve the transfer of simulator-acquired skill. Mental skills training and training to automaticity may therefore be valuable interventions to achieve this goal.  相似文献   
57.
58.
59.
60.
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