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   1748156篇
  免费   126071篇
  国内免费   4816篇
耳鼻咽喉   22654篇
儿科学   57035篇
妇产科学   47571篇
基础医学   264280篇
口腔科学   48150篇
临床医学   164855篇
内科学   331806篇
皮肤病学   36449篇
神经病学   140766篇
特种医学   63264篇
外国民族医学   422篇
外科学   247323篇
综合类   36078篇
现状与发展   1篇
一般理论   568篇
预防医学   145681篇
眼科学   39467篇
药学   131101篇
  6篇
中国医学   3989篇
肿瘤学   97577篇
  2019年   14255篇
  2018年   19895篇
  2017年   15026篇
  2016年   16370篇
  2015年   18654篇
  2014年   25568篇
  2013年   39622篇
  2012年   54215篇
  2011年   57887篇
  2010年   33696篇
  2009年   31052篇
  2008年   53525篇
  2007年   56666篇
  2006年   57071篇
  2005年   54961篇
  2004年   52768篇
  2003年   50203篇
  2002年   48812篇
  2001年   79385篇
  2000年   81915篇
  1999年   68375篇
  1998年   18988篇
  1997年   17067篇
  1996年   17152篇
  1995年   16209篇
  1994年   15109篇
  1993年   14251篇
  1992年   53960篇
  1991年   53547篇
  1990年   52409篇
  1989年   49955篇
  1988年   46276篇
  1987年   45247篇
  1986年   43101篇
  1985年   41168篇
  1984年   30857篇
  1983年   26273篇
  1982年   15485篇
  1979年   28516篇
  1978年   20426篇
  1977年   16807篇
  1976年   16445篇
  1975年   17370篇
  1974年   21063篇
  1973年   20355篇
  1972年   19195篇
  1971年   18057篇
  1970年   16699篇
  1969年   15434篇
  1968年   14629篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
31.
32.
There is an increasing number of effective therapies for fracture prevention in adults at risk of osteoporosis. However, shortcomings in the evidence underpinning our management of osteoporosis still exist. Evidence of antifracture efficacy in the groups of patients who most commonly use calcium and vitamin D supplements is lacking, the safety of calcium supplements is in doubt, and the safety and efficacy of high doses of vitamin D give cause for concern. Alendronate, risedronate, zoledronate and denosumab have been shown to prevent spine, nonspine and hip fractures; in addition, teriparatide and strontium ranelate prevent both spine and nonspine fractures, and raloxifene and ibandronate prevent spine fractures. However, most trials provide little information regarding long‐term efficacy or safety. A particular concern at present is the possibility that oral bisphosphonates might cause atypical femoral fractures. Observational data suggest that the incidence of this type of fracture increases steeply with duration of bisphosphonate use, resulting in concern that the benefit–risk balance may become negative in the long term, particularly in patients in whom the osteoporotic fracture risk is not high. Therefore, reappraisal of ongoing use of bisphosphonates after about 5 years is endorsed by expert consensus, and ‘drug holidays’ should be considered at this time. Further studies are needed to guide clinical practice in this area.  相似文献   
33.
The value of adding simeprevir (SMV) vs placebo (PBO) to peginterferon and ribavirin (PR) for treatment of chronic hepatitis C virus infection was examined using patient‐reported outcomes (PROs); further, concordance of PROs with virology endpoints and adverse events (AEs) was explored. Patients (= 768 SMV/PR,= 393 PBO/PR) rated fatigue (FSS), depressive symptoms (CES‐D) and functional impairment (WPAI: Hepatitis C Productivity, Daily Activity and Absenteeism) at baseline and throughout treatment in three randomised, double‐blind trials comparing the addition of SMV or PBO during initial 12 weeks of PR. PR was administered for 48 weeks (PBO group) and 24/48 weeks (SMV group) using a response‐guided therapy (RGT) approach. Mean PRO scores (except Absenteeism) worsened from baseline to Week 4 to the same extent in both groups but reverted after Week 24 for SMV/PR and only after Week 48 for PBO/PR. Accordingly, there was a significantly lower area under the curve (baseline–Week 60, AUC60) and fewer weeks with clinically important worsening of scores in the SMV/PR group at any time point. Incidences of patients with fatigue and anaemia AEs were similar in both groups, but FSS scores showed that clinically important increases in fatigue lasted a mean of 6.9 weeks longer with PBO/PR (P < 0.001). PRO score subgroup analysis indicated better outcomes for patients who met the criteria for RGT or achieved sustained virological response 12 weeks post‐treatment (SVR12); differences in mean PRO scores associated with fibrosis level were only observed with PBO/PR. Greater efficacy of SMV/PR enabled reduced treatment duration and reduced time with PR‐related AEs without adding to AE severity.  相似文献   
34.
European Journal of Orthopaedic Surgery & Traumatology - The goals of this study were to compare patient satisfaction and wound-related complications in patients receiving 2-octyl cyanoacrylate...  相似文献   
35.
36.
37.
Annals of Nuclear Medicine - The Response Evaluation Criteria In Solid Tumors (RECIST) is the most used radiological method for evaluating response after peptide receptor radionuclide therapy...  相似文献   
38.
39.
40.
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