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   100365篇
  免费   6223篇
  国内免费   423篇
耳鼻咽喉   1158篇
儿科学   2566篇
妇产科学   1862篇
基础医学   12402篇
口腔科学   1757篇
临床医学   10642篇
内科学   19850篇
皮肤病学   1388篇
神经病学   10188篇
特种医学   3913篇
外国民族医学   3篇
外科学   16382篇
综合类   1102篇
一般理论   132篇
预防医学   8149篇
眼科学   2131篇
药学   6487篇
中国医学   105篇
肿瘤学   6794篇
  2023年   500篇
  2022年   378篇
  2021年   1669篇
  2020年   1315篇
  2019年   2095篇
  2018年   2555篇
  2017年   1832篇
  2016年   1965篇
  2015年   2267篇
  2014年   3448篇
  2013年   4760篇
  2012年   7629篇
  2011年   8026篇
  2010年   4608篇
  2009年   4154篇
  2008年   7166篇
  2007年   7498篇
  2006年   7225篇
  2005年   6936篇
  2004年   6766篇
  2003年   6107篇
  2002年   5740篇
  2001年   883篇
  2000年   575篇
  1999年   881篇
  1998年   1048篇
  1997年   778篇
  1996年   638篇
  1995年   680篇
  1994年   590篇
  1993年   589篇
  1992年   499篇
  1991年   445篇
  1990年   388篇
  1989年   346篇
  1988年   326篇
  1987年   332篇
  1986年   286篇
  1985年   312篇
  1984年   325篇
  1983年   266篇
  1982年   341篇
  1981年   289篇
  1980年   229篇
  1979年   119篇
  1978年   145篇
  1977年   125篇
  1976年   102篇
  1975年   86篇
  1973年   93篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
ObjectiveTo determine prognostic factors and survival patterns for different treatment modalities for nasal cavity (NC) and paranasal sinus (PS) mucosal melanoma (MM).MethodsPatients from 1973 to 2013 were analyzed using the Surveillance, Epidemiology, and End Results (SEER) database. Kaplan-Meier method and multivariable cox proportional hazard modeling were used for survival analyses.ResultsOf 928 cases of mucosal melanoma (NC = 632, PS = 302), increasing age (Hazard Ratio [HR]:1.05/year, p < 0.001), T4 tumors (HR: 1.81, p = 0.02), N1 status (HR: 6.61, p < 0.001), and PS disease (HR: 1.50, p < 0.001) were associated with worse survival. Median survival length was lower for PS versus NC (16 versus 26 months, p < 0.001). Surgery and surgery + radiation therapy (RT) improved survival over non-treatment or RT alone (p < 0.001). Adding RT to surgery did not yield a survival difference compared with surgery alone (p = 0.43). Five-year survival rates for surgery and surgery + RT were similar, at 27.7% and 25.1% (p = 0.43).ConclusionSurgery increased survival significantly over RT alone. RT following surgical resection did not improve survival.  相似文献   
2.
Journal of Thrombosis and Thrombolysis - The decision by pulmonary embolism response teams (PERTs) to utilize anticoagulation (AC) with or without systemic thrombolysis (ST) or catheter-directed...  相似文献   
3.
Journal of Interventional Cardiac Electrophysiology - Atrial fibrillation is associated with an increased risk of cognitive impairment. It is unclear whether the restoration of sinus rhythm with...  相似文献   
4.
5.
6.
7.
AIDS and Behavior - A randomized controlled trial evaluated the preliminary efficacy of a dyadically-delivered motivational interviewing (MI) intervention to reduce drug use and sexual risk in a...  相似文献   
8.
9.
Inflammopharmacology - We offer an explanation how immune complexes are deposited in tissues of auto-immune disorders in humans. These disorders are characterized by the accumulation in tissues of...  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