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   3373438篇
  免费   244761篇
  国内免费   8773篇
耳鼻咽喉   46853篇
儿科学   112153篇
妇产科学   94923篇
基础医学   478067篇
口腔科学   94421篇
临床医学   303630篇
内科学   659531篇
皮肤病学   79128篇
神经病学   273676篇
特种医学   130856篇
外国民族医学   1047篇
外科学   509994篇
综合类   69420篇
现状与发展   6篇
一般理论   1192篇
预防医学   257748篇
眼科学   76840篇
药学   249309篇
  9篇
中国医学   6797篇
肿瘤学   181372篇
  2018年   36117篇
  2017年   27602篇
  2016年   31940篇
  2015年   36103篇
  2014年   49729篇
  2013年   75082篇
  2012年   100024篇
  2011年   106180篇
  2010年   63950篇
  2009年   61153篇
  2008年   99901篇
  2007年   106593篇
  2006年   108575篇
  2005年   104477篇
  2004年   100657篇
  2003年   97431篇
  2002年   94567篇
  2001年   158021篇
  2000年   161942篇
  1999年   136935篇
  1998年   39745篇
  1997年   35254篇
  1996年   35508篇
  1995年   34174篇
  1994年   31628篇
  1993年   29670篇
  1992年   108012篇
  1991年   104686篇
  1990年   101930篇
  1989年   98771篇
  1988年   90975篇
  1987年   89321篇
  1986年   84272篇
  1985年   80536篇
  1984年   59834篇
  1983年   51377篇
  1982年   30603篇
  1981年   27183篇
  1979年   54262篇
  1978年   38297篇
  1977年   32826篇
  1976年   30583篇
  1975年   33006篇
  1974年   38864篇
  1973年   37098篇
  1972年   35175篇
  1971年   32576篇
  1970年   30394篇
  1969年   29177篇
  1968年   27048篇
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
71.

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   
72.
73.

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   
74.
75.
76.
77.
Henna, derived from a combination of natural leaves and coloring additives, is a common decorative dye traditionally used in many Islamic religious celebrations. Para‐phenylenediamine (PPD), a major component of black henna tattoo, is a strong sensitizer and common allergen. We report a case of severe connubial allergic contact dermatitis after black henna heterotransfer in a girl.  相似文献   
78.
79.
80.
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