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   2376217篇
  免费   194698篇
  国内免费   4210篇
耳鼻咽喉   34287篇
儿科学   72771篇
妇产科学   62994篇
基础医学   335019篇
口腔科学   67547篇
临床医学   215705篇
内科学   468695篇
皮肤病学   47931篇
神经病学   200908篇
特种医学   95993篇
外国民族医学   886篇
外科学   360540篇
综合类   56260篇
现状与发展   1篇
一般理论   982篇
预防医学   190763篇
眼科学   55474篇
药学   177589篇
  4篇
中国医学   4365篇
肿瘤学   126411篇
  2018年   24230篇
  2016年   20599篇
  2015年   23304篇
  2014年   33560篇
  2013年   50892篇
  2012年   68805篇
  2011年   72344篇
  2010年   42521篇
  2009年   40909篇
  2008年   68831篇
  2007年   73153篇
  2006年   74065篇
  2005年   72089篇
  2004年   69406篇
  2003年   67075篇
  2002年   66303篇
  2001年   112482篇
  2000年   116559篇
  1999年   98354篇
  1998年   27868篇
  1997年   25533篇
  1996年   25456篇
  1995年   24613篇
  1994年   23165篇
  1993年   21558篇
  1992年   79399篇
  1991年   76404篇
  1990年   73590篇
  1989年   70858篇
  1988年   65859篇
  1987年   64809篇
  1986年   61342篇
  1985年   58411篇
  1984年   44226篇
  1983年   37662篇
  1982年   22892篇
  1981年   20340篇
  1980年   19042篇
  1979年   41305篇
  1978年   28997篇
  1977年   24351篇
  1976年   22835篇
  1975年   23969篇
  1974年   29643篇
  1973年   28045篇
  1972年   26226篇
  1971年   24156篇
  1970年   22753篇
  1969年   21089篇
  1968年   19137篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
101.
102.
Introduction: Major Depressive Disorder (MDD) and General Anxiety Disorder (GAD) significantly contribute to the global burden of disease. Vilazodone, a combined serotonin reuptake inhibitor and 5-HT1A partial agonist, is an approved therapy for the treatment of MDD and which has been further investigated for GAD.

Areas covered: This article covers the pharmacokinetics and pharmacodynamics of vilazodone and provides an evaluation of the clinical usefulness of vilazodone for the treatment of MDD and anxiety disorders. A literature search was performed using PubMed/MEDLINE, Web of Science and the Cochrane Library.

Expert opinion: Studies have shown that vilazodone is significantly superior to placebo. However, vilazodone cannot as yet be recommended as a first-line treatment option for MDD as it is unclear whether the drug’s dual mechanism of action provides greater efficacy than prevailing treatment options. Moreover, more phase IV studies are needed to establish its efficacy and long-term safety in larger and more diverse populations. Although vilazodone may have an additional advantage for the treatment of anxiety symptoms in MDD, here also additional studies are required to confirm its efficacy over and above SSRI alternatives and other antidepressant treatments. Therefore, presently, vilazodone should be considered as a second- or third-line treatment option for MDD and GAD.  相似文献   

103.

Background

The ZOE-50 (NCT01165177) and ZOE-70 (NCT01165229) phase 3 clinical trials showed that the adjuvanted recombinant zoster vaccine (RZV) was ≥90% efficacious in preventing herpes zoster in adults. Here we present a comprehensive overview of the safety data from these studies.

Methods

Adults aged ≥50 (ZOE-50) and ≥70 (ZOE-70) years were randomly vaccinated with RZV or placebo. Safety analyses were performed on the pooled total vaccinated cohort, consisting of participants receiving at least one dose of RZV or placebo. Solicited and unsolicited adverse events (AEs) were collected for 7 and 30?days after each vaccination, respectively. Serious AEs (SAEs) were collected from the first vaccination until 12?months post-last dose. Fatal AEs, vaccination-related SAEs, and potential immune-mediated diseases (pIMDs) were collected during the entire study period.

Results

Safety was evaluated in 14,645 RZV and 14,660 placebo recipients. More RZV than placebo recipients reported unsolicited AEs (50.5% versus 32.0%); the difference was driven by transient injection site and solicited systemic reactions that were generally seen in the first week post-vaccination. The occurrence of overall SAEs (RZV: 10.1%; Placebo: 10.4%), fatal AEs (RZV: 4.3%; Placebo: 4.6%), and pIMDs (RZV: 1.2%; Placebo: 1.4%) was balanced between groups. The occurrence of possible exacerbations of pIMDs was rare and similar between groups. Overall, except for the expected local and systemic symptoms, the safety results were comparable between the RZV and Placebo groups irrespective of participant age, gender, or race.

Conclusions

No safety concerns arose, supporting the favorable benefit-risk profile of RZV.  相似文献   
104.
105.
106.
Objective: To assess the quality of images and video clips of fetal central nervous (CNS) structures obtained by ultrasound and transmitted via tele-ultrasound from Brazil to Australia.

Methods: In this cross-sectional study, 15 normal singleton pregnant women between 20 and 26 weeks were selected. Fetal CNS structures were obtained by images and video clips. The exams were transmitted in real-time using a broadband internet and an inexpensive video streaming device. Four blinded examiners evaluated the quality of the exams using the Likert scale. We calculated the mean, standard deviation, mean difference, and p values were obtained from paired t tests.

Results: The quality of the original video clips was slightly better than that observed by the transmitted video clips; mean difference considering all observers = 0.23 points. In 47/60 comparisons (78.3%; 95% CI?=?66.4–86.9%) the quality of the video clips were judged to be the same. In 182/240 still images (75.8%; 95% CI?=?70.0–80.8%) the scores of transmitted image were considered the same as the original.

Conclusion: We demonstrated that long distance tele-ultrasound transmission of fetal CNS structures using an inexpensive video streaming device provided images of subjective good quality.  相似文献   
107.
108.
109.
110.
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