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   259726篇
  免费   60654篇
  国内免费   12165篇
耳鼻咽喉   3180篇
儿科学   6163篇
妇产科学   3070篇
基础医学   38048篇
口腔科学   8281篇
临床医学   36652篇
内科学   49406篇
皮肤病学   9711篇
神经病学   22579篇
特种医学   8960篇
外国民族医学   99篇
外科学   32214篇
综合类   30825篇
现状与发展   40篇
一般理论   43篇
预防医学   16610篇
眼科学   6163篇
药学   25762篇
  187篇
中国医学   12222篇
肿瘤学   22330篇
  2024年   634篇
  2023年   2785篇
  2022年   7063篇
  2021年   11358篇
  2020年   12324篇
  2019年   16799篇
  2018年   16607篇
  2017年   17274篇
  2016年   17538篇
  2015年   20559篇
  2014年   22462篇
  2013年   22107篇
  2012年   18950篇
  2011年   20044篇
  2010年   18859篇
  2009年   13071篇
  2008年   12555篇
  2007年   10858篇
  2006年   10453篇
  2005年   9873篇
  2004年   6651篇
  2003年   6144篇
  2002年   5258篇
  2001年   4568篇
  2000年   4638篇
  1999年   4284篇
  1998年   2409篇
  1997年   2427篇
  1996年   1851篇
  1995年   1784篇
  1994年   1552篇
  1993年   950篇
  1992年   1344篇
  1991年   1177篇
  1990年   926篇
  1989年   883篇
  1988年   787篇
  1987年   622篇
  1986年   470篇
  1985年   418篇
  1984年   198篇
  1983年   167篇
  1982年   100篇
  1981年   137篇
  1980年   81篇
  1979年   114篇
  1978年   57篇
  1977年   62篇
  1976年   46篇
  1974年   49篇
排序方式: 共有10000条查询结果,搜索用时 687 毫秒
91.
Epidermolysis bullosa simplex (EBS) is a skin fragility disorder resulting from mutations of structural proteins in the epidermis. We provide a brief report of long‐term survival and reproduction in a mother with EBS due to keratin 5 (KRT5) c.1429G > A (p.E477K) mutation, which causes a particularly severe form of the disease.  相似文献   
92.
BackgroundGeneric antidepressants are approved on the market based on evidence of bioequivalence to their brand-name versions. We aimed to assess whether generic antidepressants exert equal effectiveness as their brand-name counterparts for treating patients with depressive disorders.MethodsIn a nationwide, population-based cohort in Taiwan from 1997 through 2013, patients with a diagnosis of a depressive disorder aged between 18 and 65 years who were new users of antidepressant drugs were classified into either the brand-name group or the generic group. All patients were followed up until medication discontinuation or the end of the study period. We assessed the risk for hospitalization as a primary outcome and augmentation therapy, daily dose, medication discontinuation, or switching to another antidepressant as secondary outcomes.ResultsA total of 277 651 brand-name users (35.8% male; mean age: 41.2 years) and 270 583 generic users (35.8% male; mean age: 41.0 years) were divided into 10 different antidepressant groups (fluoxetine, sertraline, paroxetine, escitalopram, citalopram, venlafaxine, mirtazapine, moclobemide, imipramine, and bupropion). We found that patients treated with the generic form of sertraline, paroxetine, escitalopram, venlafaxine, mirtazapine, and bupropion demonstrated significantly higher risks of psychiatric hospitalization (adjusted hazard ratios ranged from 1.20–2.34), compared to their brand-name counterparts. The differences between brand-name antidepressants and their generic counterparts in secondary outcomes varied across different drugs.ConclusionsCompared to most generic antidepressants, brand-name drugs exhibited more protective effects on psychiatric hospitalization for depressive patients. These findings could serve as an important reference for clinicians when encountering patients with depressive disorder.  相似文献   
93.
目的分析米非司酮和宫瘤消胶囊的联合应用对子宫肌瘤的临床治疗效果。方法本研究对象为80例子宫肌瘤患者,收治时间均在2017年3月—2018年3月期间。将上述子宫肌瘤患者随机分成两组,各40例。给予对照组患者口服米非司酮进行治疗,研究组患者在上述治疗的基础上增加宫瘤消胶囊口服治疗,记录2组患者治疗效果,性激素水平及子宫体积及肿瘤体积变化。结果(1)研究组患者的总体有效率显著高于对照组;(2)研究组患者的P、E2、LH及FSH均显著低于对照组;(3)研究组患者子宫体积及肿瘤体积均显著低于对照组。结论米非司酮片和宫瘤消胶囊的联合治疗对子宫肌瘤患者的治疗效果较显著。  相似文献   
94.
95.
96.
97.
98.
99.
To evaluate the anthropometric indexes in subjects with varicocele compared to controls and the incidence of varicocele in different body mass index (BMI) groups for the purpose of exploring the association between varicocele and anthropometric indexes. A comprehensive literature search was conducted by using PubMed, MEDLINE, EMBASE databases and Cochrane Library up to February 2019. A systematic review and meta‐analysis was conducted by STATA, and Newcastle–Ottawa Scale was utilised for assessing risk of bias. Ultimately, 13 articles containing seven case–control studies and six cross‐sectional studies with 1,385,630 subjects were involved in our study. Pooled results demonstrated that varicocele patients had a lower BMI (WMD = ?0.77, 95% CI = ?1.03 to ?0.51) and a higher height than nonvaricocele participants, especially in grade 3 varicocele patients. Subgroup analyses showed that normal BMI individuals had a higher risk of varicocele than obese or overweight individuals and a lower risk than underweight individuals. In conclusion, this study indicates that varicocele patients have a lower BMI and a higher height than nonvaricocele participants. Moreover, men with excess bodyweight have a lower incidence of varicocele compared to normal weight or underweight people. That is to say, high BMI and adiposity protect against varicocele and high BMI is associated with a decreased risk of varicocele.  相似文献   
100.
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