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   81352篇
  免费   3302篇
  国内免费   751篇
耳鼻咽喉   505篇
儿科学   1501篇
妇产科学   912篇
基础医学   8266篇
口腔科学   3899篇
临床医学   6294篇
内科学   16584篇
皮肤病学   1582篇
神经病学   5987篇
特种医学   2345篇
外国民族医学   1篇
外科学   13748篇
综合类   4319篇
现状与发展   1篇
一般理论   5篇
预防医学   7038篇
眼科学   1673篇
药学   5248篇
  19篇
中国医学   2643篇
肿瘤学   2835篇
  2023年   1189篇
  2022年   1857篇
  2021年   3418篇
  2020年   2321篇
  2019年   6368篇
  2018年   6508篇
  2017年   4024篇
  2016年   1373篇
  2015年   1366篇
  2014年   2822篇
  2013年   2800篇
  2012年   1917篇
  2011年   2275篇
  2010年   1942篇
  2009年   1605篇
  2008年   1693篇
  2007年   1597篇
  2006年   1340篇
  2005年   1108篇
  2004年   913篇
  2003年   900篇
  2002年   675篇
  2001年   644篇
  2000年   553篇
  1999年   534篇
  1998年   346篇
  1997年   336篇
  1996年   312篇
  1995年   307篇
  1994年   261篇
  1993年   238篇
  1992年   244篇
  1991年   201篇
  1990年   178篇
  1989年   166篇
  1988年   163篇
  1986年   142篇
  1985年   2890篇
  1984年   3437篇
  1983年   2898篇
  1982年   3365篇
  1981年   3054篇
  1980年   2545篇
  1979年   2528篇
  1978年   2079篇
  1977年   1555篇
  1976年   2004篇
  1975年   1522篇
  1974年   1330篇
  1973年   1281篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
21.
22.
23.
24.
《Neuro-Chirurgie》2022,68(3):262-266
BackgroundThe prognosis for patients with recurrent glioblastoma (GBM) is dismal, and the question of repeat surgery at time of recurrence is common. Re-operation in the management of these patients remains controversial, as there is no randomized evidence of benefit. An all-inclusive pragmatic care trial is needed to evaluate the role of repeat resection.Methods3rGBM is a multicenter, pragmatic, prospective, parallel-group randomized care trial, with 1:1 allocation to repeat resection or standard care with no repeat resection. To test the hypothesis that repeat resection can improve overall survival by at least 3 months (from 6 to 9 months), 250 adult patients with prior resection of pathology-proven glioblastoma for whom the attending surgeon believes repeat resection may improve quality survival will be enrolled. A surrogate measure of quality of life, the number of days outside of hospital/nursing/palliative care facility, will also be compared. Centers are invited to participate without financial compensation and without contracts. Clinicians may apply to local authorities to approve an investigator-led in-house trial, using a common protocol, web-based randomization platform, and simple standardized case report forms.DiscussionThe 3rGBM trial is a modern transparent care research framework with no additional risks, tests, or visits other than what patients would encounter in normal care. The burden of proof remains on repeat surgical management of recurrent GBM, because this management has yet to be shown beneficial. The trial is designed to help patients and surgeons manage the uncertainty regarding optimal care.Clinical Trial Registrationhttp://www.clinicaltrials.gov. Unique identifier: NCT04838782.  相似文献   
25.
26.
27.
28.
PurposeTo investigate the safety of yttrium-90 radioembolization in combination with checkpoint inhibitor immunotherapy for the treatment of hepatocellular carcinoma (HCC).Materials and MethodsThis single-center retrospective study included 26 consecutive patients with HCC who received checkpoint inhibitor immunotherapy within 90 days of radioembolization from April 2015 to May 2018. Patients had preserved liver function (Child-Pugh scores A–B7) and either advanced HCC due to macrovascular invasion or limited extrahepatic disease (21 patients) or aggressive intermediate stage HCC that resulted in earlier incorporation of systemic immunotherapy (5 patients). Clinical documentation, laboratory results, and imaging results at 1- and 3-month follow-up intervals were reviewed to assess treatment-related adverse events and treatment responses.ResultsThe median follow-up period after radioembolization was 7.8 months (95% confidence interval [CI], 5.6–11.8). There were no early (30-day) mortality or grades 3/4 hepatobiliary or immunotherapy-related toxicities. Delayed grades 3/4 hepatobiliary toxicities (1–3 months) occurred in 2 patients in the setting of HCC disease progression. One patient developed pneumonitis. The median overall survival from first immunotherapy was 17.2 months (95% CI, 10.9–23.4). The median overall survival from first radioembolization was 16.5 months (95% CI, 6.6–26.4). From first radioembolization, time to tumor progression was 5.7 months (95% CI, 4.2–7.2), and progression-free survival was 5.7 months (95% CI, 4.3–7.1).ConclusionsRadioembolization combined with checkpoint inhibitor immunotherapy in cases of HCC appears to be safe and causes limited treatment-related toxicity. Future prospective studies are needed to identify the optimal combination treatment protocols and evaluate the efficacy of combination therapy.  相似文献   
29.
30.
《Vaccine》2016,34(43):5155-5158
BackgroundGrowing conflict and insecurity played a major role in precipitating polio outbreaks in the Horn of Africa and the Middle East. In Angola, the early post-conflict situation was characterized by the presence of many inaccessible zones and districts due to insecurity and poor infrastructure. Partnership with the Angolan Army health service (AAHS) was one of the innovative strategies that the Polio Eradication Initiative (PEI) introduced into the country to support the polio vaccination campaigns in insecure and hard to reach zones.MethodsBefore embarking on creating a partnership with Angolan military it was essential to make high-level advocacy with top military decision makers to engage the leadership in the process for better and sustainable support to the strategy. The principal supports provided by the AAHS were the administration of oral polio vaccine, vitamin A, deworming agents, social mobilization, monitoring campaign quality, and surveillance. Distribution of logistics using military vehicles and helicopters to hard to reach and insecure zones was also part of the support.ResultsUsing this partnership it was possible to reach a significant number of children in insecure and hard to reach areas with polio vaccine and other child survival interventions. The military partnership also contributed in increasing the demand and addressing rejection for the polio vaccine.ConclusionMilitary is a potentially productive force that can be used for any development activities in any country. The Angolan experience has demonstrated that it is possible to form a partnership with the military for basic health intervention activities with little training and investment.  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