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   3006175篇
  免费   241633篇
  国内免费   6126篇
耳鼻咽喉   42956篇
儿科学   95769篇
妇产科学   81758篇
基础医学   426742篇
口腔科学   86958篇
临床医学   275283篇
内科学   583156篇
皮肤病学   63683篇
神经病学   249789篇
特种医学   119226篇
外国民族医学   1131篇
外科学   453179篇
综合类   72407篇
现状与发展   1篇
一般理论   1286篇
预防医学   243911篇
眼科学   71065篇
药学   222994篇
  7篇
中国医学   5724篇
肿瘤学   156909篇
  2018年   31097篇
  2016年   26717篇
  2015年   30049篇
  2014年   42958篇
  2013年   65753篇
  2012年   87976篇
  2011年   92971篇
  2010年   55129篇
  2009年   52512篇
  2008年   87947篇
  2007年   93596篇
  2006年   94617篇
  2005年   91900篇
  2004年   88903篇
  2003年   85694篇
  2002年   84006篇
  2001年   137806篇
  2000年   142609篇
  1999年   120346篇
  1998年   35022篇
  1997年   31765篇
  1996年   31396篇
  1995年   30432篇
  1994年   28575篇
  1993年   26538篇
  1992年   97282篇
  1991年   94308篇
  1990年   91386篇
  1989年   88106篇
  1988年   81405篇
  1987年   80565篇
  1986年   76139篇
  1985年   72976篇
  1984年   55321篇
  1983年   47199篇
  1982年   28794篇
  1981年   25667篇
  1980年   24045篇
  1979年   52002篇
  1978年   36741篇
  1977年   31069篇
  1976年   29293篇
  1975年   30771篇
  1974年   37911篇
  1973年   36071篇
  1972年   33667篇
  1971年   31256篇
  1970年   29213篇
  1969年   27226篇
  1968年   24879篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
51.

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   
52.
53.
54.
55.
56.
We report two British cases of liver abscess, due to Klebsiella pneumoniae and associated with synchronous infection elsewhere, which required liver resection for definitive treatment. They illustrate the geographic spread of aggressive K pneumoniae liver infection and demonstrate the importance of early aggressive treatment.  相似文献   
57.
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   
58.
59.
60.
Acne vulgaris (acne) is a chronic inflammatory disease of the sebaceous gland, characterized by follicular hyperkeratinization, excessive colonization by Propionibacterium acnes (Pacnes) as well as immune reactions and inflammation. Despite an armamentarium of topical treatments available including benzoyl peroxide, retinoids and azelaic acid, topical antibiotics in monotherapies, especially erythromycin and clindamycin, are still used in Europe to treat acne. This intensive use led to antimicrobial‐resistant P. acnes and staphylococci strains becoming one of the main health issues worldwide. This is an update on the current topical acne treatments available in Europe, their mechanism of action, their potential to induce antimicrobial resistance and their clinical efficacy and safety.  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