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   3959478篇
  免费   300418篇
  国内免费   6826篇
耳鼻咽喉   56781篇
儿科学   125542篇
妇产科学   106246篇
基础医学   570587篇
口腔科学   113406篇
临床医学   364520篇
内科学   756830篇
皮肤病学   84011篇
神经病学   323287篇
特种医学   152586篇
外国民族医学   1282篇
外科学   594108篇
综合类   89730篇
现状与发展   13篇
一般理论   1654篇
预防医学   321743篇
眼科学   94370篇
药学   296336篇
  14篇
中国医学   7639篇
肿瘤学   206037篇
  2018年   42969篇
  2017年   32672篇
  2016年   36443篇
  2015年   41162篇
  2014年   58893篇
  2013年   89226篇
  2012年   121604篇
  2011年   129181篇
  2010年   76673篇
  2009年   72678篇
  2008年   121367篇
  2007年   129228篇
  2006年   130337篇
  2005年   126591篇
  2004年   121593篇
  2003年   116888篇
  2002年   114445篇
  2001年   175703篇
  2000年   181198篇
  1999年   153371篇
  1998年   46026篇
  1997年   40768篇
  1996年   40314篇
  1995年   38581篇
  1994年   35985篇
  1993年   33770篇
  1992年   121994篇
  1991年   118977篇
  1990年   115627篇
  1989年   111397篇
  1988年   103244篇
  1987年   101360篇
  1986年   95714篇
  1985年   91989篇
  1984年   69485篇
  1983年   59302篇
  1982年   35898篇
  1981年   32142篇
  1979年   65160篇
  1978年   46196篇
  1977年   38758篇
  1976年   36937篇
  1975年   39171篇
  1974年   47752篇
  1973年   45468篇
  1972年   42982篇
  1971年   40230篇
  1970年   37434篇
  1969年   35219篇
  1968年   32355篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
71.
72.
73.

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   
74.
75.
76.
77.
While previous randomised controlled trials and meta-analyses offer only limited evidence for the effectiveness of cognitive rehabilitation, qualitative studies examining patient perspectives report more positive outcomes. This meta-synthesis of qualitative studies examined patient perspectives of cognitive rehabilitation for memory, attention, and executive function problems in people with multiple sclerosis. Using set eligibility criteria, we screened electronic databases, reference lists, and academic networks for relevant papers. Seven papers (195 participants) were selected. Two independent researchers conducted quality appraisals of papers. Data analysis, guided by the thematic synthesis approach, yielded six main themes. These suggested that patients benefitted from the group environment in rehabilitation. Cognitive rehabilitation facilitated the participants’ reflection and awareness of their cognitive deficits, and was associated with increased knowledge and understanding of their illness. Increased strategy use was reported and associated with improvements in cognitive functioning and greater confidence and perseverance. Participants reported emotional and social improvements, and felt more optimistic. Overall, these changes had a positive impact on participants’ quality of life. This synthesis of qualitative studies indicates that people with multiple sclerosis who experience cognitive deficits benefit from cognitive rehabilitation programmes. This finding must, however, be viewed in light of the limitations of this meta-synthesis. The meta-synthesis was registered in the PROSPERO database under CRD42017040148.  相似文献   
78.
79.
80.
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   
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