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   96322篇
  免费   7317篇
  国内免费   299篇
耳鼻咽喉   1054篇
儿科学   2676篇
妇产科学   1439篇
基础医学   13346篇
口腔科学   1127篇
临床医学   10139篇
内科学   20771篇
皮肤病学   1118篇
神经病学   9651篇
特种医学   3627篇
外国民族医学   3篇
外科学   14981篇
综合类   1074篇
一般理论   98篇
预防医学   7052篇
眼科学   2609篇
药学   6174篇
中国医学   108篇
肿瘤学   6891篇
  2023年   657篇
  2022年   962篇
  2021年   2599篇
  2020年   1482篇
  2019年   2431篇
  2018年   2785篇
  2017年   2012篇
  2016年   2138篇
  2015年   2472篇
  2014年   3544篇
  2013年   4556篇
  2012年   7246篇
  2011年   7531篇
  2010年   4128篇
  2009年   3645篇
  2008年   6017篇
  2007年   6362篇
  2006年   5923篇
  2005年   5840篇
  2004年   5363篇
  2003年   4881篇
  2002年   4535篇
  2001年   1195篇
  2000年   986篇
  1999年   1036篇
  1998年   977篇
  1997年   751篇
  1996年   618篇
  1995年   590篇
  1994年   543篇
  1993年   530篇
  1992年   681篇
  1991年   603篇
  1990年   583篇
  1989年   516篇
  1988年   502篇
  1987年   465篇
  1986年   479篇
  1985年   454篇
  1984年   445篇
  1983年   375篇
  1982年   397篇
  1981年   388篇
  1980年   298篇
  1979年   313篇
  1978年   301篇
  1977年   232篇
  1976年   206篇
  1974年   214篇
  1973年   205篇
排序方式: 共有10000条查询结果,搜索用时 218 毫秒
1.
2.
3.
4.
Heart Failure Reviews - The nitric oxide (NO)–guanylate cyclase (GC)–cyclic guanosine monophosphate (cGMP) pathway plays an important role in cardiovascular, pulmonary and renal...  相似文献   
5.
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   
6.
7.
Abstract

Objective

Ras wild-type metastatic colorectal cancers (mCRC) may be treated with anti-vascular endothelial growth factor (VEGF) or anti-epidermal growth factor receptor (EGFR) agents. We aim to estimate patients’ preferences for mCRC treatment and relative importance of cost, efficacy improvement, avoidance of side effects and therapy convenience, and relative uptake between profiles that resemble Bevacizumab (anti-VEGF) and Cetuximab (anti-EGFR), two commonly prescribed mCRC targeted therapies.  相似文献   
8.
9.
10.
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   
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