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   1408649篇
  免费   105167篇
  国内免费   2270篇
耳鼻咽喉   20150篇
儿科学   48006篇
妇产科学   38043篇
基础医学   201550篇
口腔科学   38285篇
临床医学   118844篇
内科学   286700篇
皮肤病学   31583篇
神经病学   111271篇
特种医学   54388篇
外国民族医学   661篇
外科学   211077篇
综合类   27689篇
现状与发展   1篇
一般理论   397篇
预防医学   111850篇
眼科学   31581篇
药学   105308篇
  2篇
中国医学   2960篇
肿瘤学   75740篇
  2019年   11357篇
  2018年   17150篇
  2017年   12500篇
  2016年   13449篇
  2015年   15200篇
  2014年   20275篇
  2013年   30982篇
  2012年   44355篇
  2011年   46772篇
  2010年   27112篇
  2009年   24895篇
  2008年   43780篇
  2007年   46909篇
  2006年   46855篇
  2005年   45479篇
  2004年   43974篇
  2003年   42455篇
  2002年   41504篇
  2001年   67388篇
  2000年   70305篇
  1999年   59344篇
  1998年   15673篇
  1997年   14107篇
  1996年   14544篇
  1995年   13752篇
  1994年   13022篇
  1993年   12004篇
  1992年   46254篇
  1991年   44999篇
  1990年   43687篇
  1989年   41432篇
  1988年   38159篇
  1987年   37403篇
  1986年   34814篇
  1985年   33441篇
  1984年   24991篇
  1983年   20994篇
  1982年   12103篇
  1981年   11013篇
  1979年   22338篇
  1978年   15491篇
  1977年   13191篇
  1976年   12333篇
  1975年   13383篇
  1974年   15649篇
  1973年   15132篇
  1972年   13916篇
  1971年   12675篇
  1970年   11931篇
  1969年   10978篇
排序方式: 共有10000条查询结果,搜索用时 46 毫秒
21.
22.
23.
24.
25.
Introduction: The treatment of classical Hodgkin lymphoma (cHL) in children is a story of success. Nowadays, more than 90% of patients are cured and overall survival is nearly 100% at 5 years. Efforts have been made to avoid related effects of therapies; therefore, children are treated using different chemotherapy schemes in comparison with adults.

Areas covered: This review includes a view of the clinical classification and risk assessment in children suffering from HL. The chemotherapy more commonly employed is revisited. The use of PET/CT to evaluate the disease in order to guide therapy is analyzed. New options of chemotherapy and emerging immunotherapy are also included.

Expert opinion: In order to make the right treatment choice, a proper initial assessment of risk is mandatory. The choice of therapy in these kinds of patients must be done according to the experience of the team, and also, the cost and logistics related to the eligible scheme are very important. If possible, efforts must be made to include PET/CT in guiding therapy and avoiding overtreatment and long-term adverse effects in children. New options in immunotherapy are emerging and must be considered with caution in selected patients.  相似文献   

26.

Purpose

Endovascular treatment with mechanical thrombectomy devices demonstrated high recanalization rates but functional outcome did not correlate with high rates of recanalization obtained. Patient selection prior to the endovascular treatment is very important in the final outcome of the patient. The primary aim of our study was to evaluate the prognostic value of posterior circulation Alberta Stroke Program Early CT Score (pc-ASPECTS) and Pons-Midbrain Index (PMI) scores in patients with Basilar Artery Occlusion (BAO) treated with successful angiographic recanalization after mechanical thrombectomy.

Methods

Retrospective single-center study including 18 patients between 2008 and 2013 who had acute basilar artery occlusion managed with endovascular treatment within 24 hours from symptoms onset and with successful angiographic recanalization. The patients were initially classified into two groups according to clinical outcome and mortality at 90 days. For analysis we also divided patients into groups based on pc-ASPECTS (≥8vs.< 8) and PMI (≥3vs.< 3) on non-contrast CT (NCCT) and CT Angiography Source Images (CTASI). Imaging data were correlated to clinical outcome and mortality rate.

Results

CTASI pc-ASPECTS, dichotomized at < 8 versus≥8, was associated with a favorable outcome (RR: 2.6; 95% CI: 1.3-5.2) and a reduced risk of death (RR: 6.5: 95% CI: 7.8-23.3). All patients that survived and were functionally independent had pc-ASPECTS score≥8. None of the 5 patients with CTASI pc-ASPECTS score less than 8 survived.

Conclusion

PC-ASPECTS on CTASI is helpful for predicting functional outcome after BAO recanalization with endovascular treatment. These results should be validated in a randomized controlled trial in order to decide whether or not to treat a patient with BAO.  相似文献   
27.
Purpose: To use polymerase chain reaction (PCR) and Goldmann-Witmer coefficient (GWC) calculation to diagnose infectious uveitis.

Methods: Prospective cross-sectional study.

Results: Twenty-seven of 106 patients had positive PCR and/or GWC results on aqueous humor (AH) sampling and 15 of 27 (55.6%) were HIV-positive. Patients with non-anterior uveitis (NAU) were more likely to be HIV+ (p = 0.005). More than 1 possible pathogen was identified in 9 of 27 patients of whom 7 were HIV+. The final clinical diagnosis was discordant with AH findings in 9 of 27 cases. A positive EBV PCR result was associated with a discordant diagnosis (p = 0.001). All cases of herpetic anterior uveitis (42.9% HIV+) tested PCR-/GWC+ while all cases of herpetic NAU tested PCR+/GWC- (83.3% HIV+). All rubella virus cases were PCR+/GWC+.

Conclusion: PCR is useful to diagnose herpetic NAU in HIV+ patients while GWC is useful to diagnose herpetic anterior uveitis.  相似文献   

28.
29.
30.
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