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   141500篇
  免费   9208篇
  国内免费   2902篇
耳鼻咽喉   1453篇
儿科学   3654篇
妇产科学   2843篇
基础医学   18985篇
口腔科学   2936篇
临床医学   12800篇
内科学   27201篇
皮肤病学   2438篇
神经病学   11921篇
特种医学   5829篇
外国民族医学   43篇
外科学   19137篇
综合类   8550篇
现状与发展   13篇
一般理论   81篇
预防医学   8528篇
眼科学   2375篇
药学   12166篇
  67篇
中国医学   2357篇
肿瘤学   10233篇
  2023年   926篇
  2022年   1513篇
  2021年   4196篇
  2020年   2901篇
  2019年   3497篇
  2018年   4397篇
  2017年   3369篇
  2016年   3746篇
  2015年   4464篇
  2014年   5629篇
  2013年   7067篇
  2012年   8375篇
  2011年   8059篇
  2010年   5953篇
  2009年   4948篇
  2008年   6413篇
  2007年   6636篇
  2006年   6269篇
  2005年   5979篇
  2004年   5891篇
  2003年   5610篇
  2002年   5430篇
  2001年   4597篇
  2000年   4560篇
  1999年   3797篇
  1998年   1725篇
  1997年   1434篇
  1996年   1173篇
  1995年   1107篇
  1994年   974篇
  1993年   887篇
  1992年   1983篇
  1991年   1949篇
  1990年   1623篇
  1989年   1574篇
  1988年   1471篇
  1987年   1281篇
  1986年   1235篇
  1985年   1087篇
  1984年   815篇
  1983年   715篇
  1982年   485篇
  1981年   395篇
  1979年   576篇
  1978年   423篇
  1975年   442篇
  1974年   486篇
  1973年   465篇
  1972年   426篇
  1971年   413篇
排序方式: 共有10000条查询结果,搜索用时 296 毫秒
41.
Background: Egyptian street youth use substances including tobacco, illicit drugs, and pharmaceutical drugs. To understand the circumstances, including adverse childhood experiences, that place adolescents at risk for engaging in substance use, we conducted in-depth interviews among a sample of Egyptian street children. Methods: From youth residing at or attending Caritas, a non-profit organization, which provides shelter and education to street youth, seven girls and twelve boys, aged 12–18 years, participated in open-ended, in-depth interviews. Results: Eight out of the 19 participants reported family history (early exposure) to substance use; and seven of them were initiated by either a family member (sibling), friend or coworker. Most of the participants reported a history of conflict with or abuse (verbal or physical) by their parents or siblings, or stressful situations at home; they used substance(s) to alleviate their stress. Few attended school, and some were forced to work and help their family. Conclusions: Among Egyptian youth, adverse childhood experiences, such as poverty, child abuse, and family substance use, challenge somewhat susceptible youths and lead them to the path of substance use and addiction. Prevention intervention should be multifaceted, culturally adaptable, and primarily targeting the social environment during childhood.  相似文献   
42.
43.
44.
45.
Bulletin of Experimental Biology and Medicine - Fast neutron therapy, which previously has demonstrated effective results, but along with a large number of complications, can again be considered a...  相似文献   
46.
47.
48.
49.
Lung - Diaphragmatic paralysis (DP) is an important cause of dyspnea with many underlying etiologies; however, frequently no cause is identified despite extensive investigation. We hypothesized...  相似文献   
50.

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   
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