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   1698044篇
  免费   117237篇
  国内免费   2432篇
耳鼻咽喉   23614篇
儿科学   56194篇
妇产科学   48273篇
基础医学   258809篇
口腔科学   45701篇
临床医学   148068篇
内科学   326119篇
皮肤病学   36337篇
神经病学   127516篇
特种医学   66018篇
外国民族医学   410篇
外科学   259280篇
综合类   33330篇
现状与发展   2篇
一般理论   414篇
预防医学   124830篇
眼科学   39125篇
药学   129739篇
  2篇
中国医学   3369篇
肿瘤学   90563篇
  2018年   16541篇
  2016年   14087篇
  2015年   16055篇
  2014年   21981篇
  2013年   33262篇
  2012年   46639篇
  2011年   50382篇
  2010年   29511篇
  2009年   27412篇
  2008年   47966篇
  2007年   52176篇
  2006年   52503篇
  2005年   51088篇
  2004年   49435篇
  2003年   48011篇
  2002年   46950篇
  2001年   74923篇
  2000年   76902篇
  1999年   65022篇
  1998年   18428篇
  1997年   16230篇
  1996年   16499篇
  1995年   15545篇
  1994年   14622篇
  1993年   13680篇
  1992年   51911篇
  1991年   52269篇
  1990年   51810篇
  1989年   50472篇
  1988年   46988篇
  1987年   46201篇
  1986年   43828篇
  1985年   41904篇
  1984年   31248篇
  1983年   27050篇
  1982年   15668篇
  1981年   13987篇
  1979年   29754篇
  1978年   20973篇
  1977年   17888篇
  1976年   17310篇
  1975年   19428篇
  1974年   22701篇
  1973年   21878篇
  1972年   20643篇
  1971年   19384篇
  1970年   18071篇
  1969年   17209篇
  1968年   16230篇
  1967年   14394篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
2.
Journal of Behavioral Medicine - Evidence supports the use of graphic warnings to educate the public about the health harms of smoking and suggests warnings eliciting negative emotional responses...  相似文献   
3.
The adrenal cortex gives rise to a biologically heterogenous group of neoplasms, each with a distinct morphology, antigen expression and molecular profile. Adrenal cortical adenomas have excellent prognosis and are usually cured by surgical resection alone, while adrenal cortical carcinomas are very aggressive tumors with a poor prognosis regardless of therapy. These tumors are rare and often challenging for a pathologist to diagnose, as significant overlap exists between benign and malignant lesions in some cases. In this review, we attempt to summarize most important histologic and clinical features of adrenal cortical adenomas and carcinomas, clarify the use of different grading systems, the use of special stains and the differential diagnosis for practicing pathologists. Most relevant hereditary syndromes associated with adrenal cortical tumors are listed. Updates in molecular alterations in adrenal cortical neoplasms and hyperplastic diseases as well as their clinical significance and potential therapeutic implications are also discussed.  相似文献   
4.
5.
6.
7.
8.
9.
Journal of Immigrant and Minority Health - COVID-19 has disproportionally affected underrepresented minorities (URM) and low-income immigrants in the United States. The aim of the study is to...  相似文献   
10.
Vaccination is a vital health care initiative to prevent individual and population infection. To increase vaccination rates the federal government implemented the ‘No Jab, No Pay’ policy, where eligibility for several government benefits required children to be fully vaccinated by removing ‘conscientious objections’ and expanding the age range of children whose families receive benefits. This study assesses the impact of this policy at a local area within a single medical practice community in NSW, Australia. A retrospective clinical audit was performed between 2012 and 2017 on a single general practice's vaccination records for children ≤19 years. Catch-up vaccinations were assessed based on age at vaccination. Incidence of catch-up vaccinations was assessed for each of four years before and two years after the implementation of the ‘No Jab, No Pay’ policy in January 2016, along with the age of children and vaccination(s) given. Catch-up vaccinations were assessed temporally either side of implementation of ‘No Jab, No Pay’. Comparing the average annual vaccination catch-up incidence rate of 6.2% pre-implementation (2012–2015), there was an increase to 9.2% in 2016 (p < .001) and 7.8% in 2017 (p = .027). Secondary outcome measurement of catch-up vaccination incidence rates before (2012–2015) and after (2016–2017) ‘No Jab, No Pay’ implementation showed statistically significant increases for children aged 8–11 years (3.2%–5.6%, p = .038), 12–15 years (7.5%–14.7%, p < .001) and 16–19 years (3.3%–10.2%, p < .001) along with a statistically significant reduction in children aged 1–3 years (11.4%–6.2%, p = .015). Also, catch-up rates for DTPa significantly increased after program implementation. This study demonstrates that the Australian federal government vaccination policy ‘No Jab, No Pay’ was coincident with an increase in catch-up vaccinations within a rural NSW community served by one medical practice, especially for older children.  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