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   625629篇
  免费   34333篇
  国内免费   908篇
耳鼻咽喉   7778篇
儿科学   19365篇
妇产科学   14153篇
基础医学   104641篇
口腔科学   14020篇
临床医学   58735篇
内科学   114563篇
皮肤病学   13162篇
神经病学   43772篇
特种医学   23490篇
外国民族医学   53篇
外科学   93826篇
综合类   8642篇
现状与发展   2篇
一般理论   234篇
预防医学   46443篇
眼科学   13934篇
药学   47665篇
  1篇
中国医学   1223篇
肿瘤学   35168篇
  2021年   5898篇
  2019年   5910篇
  2018年   8190篇
  2017年   5880篇
  2016年   6785篇
  2015年   7563篇
  2014年   10428篇
  2013年   15071篇
  2012年   22805篇
  2011年   25061篇
  2010年   14374篇
  2009年   12801篇
  2008年   22585篇
  2007年   24614篇
  2006年   23887篇
  2005年   22943篇
  2004年   22388篇
  2003年   21085篇
  2002年   20316篇
  2001年   23234篇
  2000年   23502篇
  1999年   19778篇
  1998年   6414篇
  1997年   5253篇
  1996年   5115篇
  1995年   4777篇
  1992年   14840篇
  1991年   16201篇
  1990年   16258篇
  1989年   15911篇
  1988年   14574篇
  1987年   14460篇
  1986年   13402篇
  1985年   12957篇
  1984年   9690篇
  1983年   8240篇
  1982年   4505篇
  1979年   9028篇
  1978年   6505篇
  1977年   5251篇
  1976年   5579篇
  1975年   6676篇
  1974年   7473篇
  1973年   7220篇
  1972年   6639篇
  1971年   6337篇
  1970年   5912篇
  1969年   5498篇
  1968年   5191篇
  1967年   4635篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
2.
3.
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   
4.
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   
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