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   3509195篇
  免费   295359篇
  国内免费   14552篇
耳鼻咽喉   49811篇
儿科学   112426篇
妇产科学   91268篇
基础医学   548206篇
口腔科学   94193篇
临床医学   317574篇
内科学   625692篇
皮肤病学   95312篇
神经病学   298998篇
特种医学   138797篇
外国民族医学   391篇
外科学   555267篇
综合类   102759篇
现状与发展   91篇
一般理论   2206篇
预防医学   290314篇
眼科学   80900篇
药学   239859篇
  23篇
中国医学   9797篇
肿瘤学   165222篇
  2021年   56033篇
  2020年   37413篇
  2019年   58823篇
  2018年   74392篇
  2017年   57358篇
  2016年   63284篇
  2015年   77440篇
  2014年   114378篇
  2013年   179593篇
  2012年   92414篇
  2011年   92609篇
  2010年   120752篇
  2009年   126678篇
  2008年   80756篇
  2007年   83518篇
  2006年   95137篇
  2005年   90181篇
  2004年   91543篇
  2003年   82619篇
  2002年   72994篇
  2001年   105717篇
  2000年   98083篇
  1999年   98415篇
  1998年   66763篇
  1997年   64193篇
  1996年   61829篇
  1995年   57179篇
  1994年   51176篇
  1993年   47507篇
  1992年   69939篇
  1991年   67268篇
  1990年   64547篇
  1989年   63720篇
  1988年   59630篇
  1987年   58046篇
  1986年   55392篇
  1985年   55282篇
  1984年   49808篇
  1983年   45825篇
  1982年   42266篇
  1981年   39717篇
  1980年   37424篇
  1979年   41859篇
  1978年   36505篇
  1977年   33475篇
  1976年   30814篇
  1975年   30056篇
  1974年   31285篇
  1973年   30083篇
  1972年   28368篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
51.
52.
A 42‐year‐old man presented with a viral prodrome and tested positive for influenza A. He rapidly deteriorated developing cardiogenic shock, rhabdomyolysis, and acute kidney injury. Patient improved 1 week later with supportive measures including vasopressors, inotropes, and an intraaortic balloon pump. We report this case as it highlights the discordance between echocardiographic ventricular wall thickening as a result of myocardial edema, and electrocardiographic findings at presentation, with a reversal in findings at time of resolution. Additionally, there was some suggestion of a regional pattern to the reduced longitudinal strain.  相似文献   
53.
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   
54.
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   
55.
56.
57.
58.
59.
60.
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