全文获取类型
收费全文 | 126561篇 |
免费 | 6133篇 |
国内免费 | 970篇 |
专业分类
耳鼻咽喉 | 2182篇 |
儿科学 | 6385篇 |
妇产科学 | 2716篇 |
基础医学 | 10507篇 |
口腔科学 | 5040篇 |
临床医学 | 8714篇 |
内科学 | 26727篇 |
皮肤病学 | 4533篇 |
神经病学 | 7798篇 |
特种医学 | 5770篇 |
外国民族医学 | 1篇 |
外科学 | 27602篇 |
综合类 | 3864篇 |
现状与发展 | 1篇 |
预防医学 | 6196篇 |
眼科学 | 5546篇 |
药学 | 5628篇 |
9篇 | |
中国医学 | 1021篇 |
肿瘤学 | 3424篇 |
出版年
2023年 | 3689篇 |
2022年 | 4375篇 |
2021年 | 6404篇 |
2020年 | 4857篇 |
2019年 | 11962篇 |
2018年 | 9095篇 |
2017年 | 4774篇 |
2016年 | 1899篇 |
2015年 | 2434篇 |
2014年 | 3512篇 |
2013年 | 2311篇 |
2012年 | 1607篇 |
2011年 | 5140篇 |
2010年 | 1986篇 |
2009年 | 2423篇 |
2008年 | 2457篇 |
2007年 | 1956篇 |
2006年 | 1679篇 |
2005年 | 2121篇 |
2004年 | 2113篇 |
2003年 | 1536篇 |
2002年 | 1995篇 |
2001年 | 2356篇 |
2000年 | 3312篇 |
1999年 | 3580篇 |
1998年 | 3379篇 |
1997年 | 2390篇 |
1996年 | 1651篇 |
1995年 | 1161篇 |
1994年 | 1183篇 |
1993年 | 859篇 |
1992年 | 880篇 |
1991年 | 752篇 |
1990年 | 751篇 |
1989年 | 545篇 |
1988年 | 586篇 |
1987年 | 406篇 |
1985年 | 2835篇 |
1984年 | 4120篇 |
1983年 | 2940篇 |
1982年 | 2874篇 |
1981年 | 2708篇 |
1980年 | 2388篇 |
1979年 | 2198篇 |
1978年 | 1812篇 |
1977年 | 1566篇 |
1976年 | 1692篇 |
1975年 | 1437篇 |
1974年 | 1267篇 |
1973年 | 1201篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
41.
BackgroundLymph node recurrences (LNR) from colorectal cancer (CRC) still represent a therapeutic challenge, as standardized recommendations have yet to be established. The aim of this study was to analyze short- and long-term oncological outcomes following resection of LNR from CRC.MethodsAll patients with previously resected CRC who underwent histopathologically confirmed LNR resection in 3 tertiary referral centers between 2010 and 2017 were reviewed. Short- and long-term outcomes were analyzed, mainly recurrence-free and overall survival. Further recurrences following LNR resection were also analyzed.ResultsOverall, 18 patients were included. Primary CRC was left-sided in 16 (89%) patients, staged T3-4 in 15 (83%), N+ in 14 (78%) and presented with synchronous metastases in 8 (43%). Median time interval between primary CRC and LNR resections was 31 months. Performed lymphadenectomies were aortocaval (n = 10), pelvic (n = 7), in hepatic pedicle (n = 3) and mesenteric (n = 1). Four patients had associated liver metastases resection. Three (17%) presented with postoperative complications, of which one Clavien-Dindo 3. Fourteen (78%) patients presented with further recurrences after a mean delay of 9 months, with 36% of patients presenting with early (<6 months) recurrence. Five (36%) patients could undergo secondary recurrence resection and 3 (21%) patients radiotherapy. Median overall survival following LNR resection reached 44 months.ConclusionsCurrent results suggest that LNR resection is feasible and associated with improved survival, in selected patients. Longer time interval between primary CRC resection and LNR occurrence appeared to be a favorable prognostic factor whereas multisite recurrence appeared to be associated with impaired long-term survival. 相似文献
42.
43.
44.
45.
46.
47.
48.
49.
《Vaccine》2020,38(45):7118-7128
IntroductionToward the Global Vaccine Action Plan 2020 goal, almost 90% of countries have established a National Immunization Technical Advisory Group (NITAG). However, little is known about NITAG's contributions to governance.MethodsIn 2017–2018, a two-step, qualitative retrospective study was conducted. Jordan (JO), Argentina (AR), and South Africa (SA) were selected owing to government-financed NITAGs from middle-income countries (MICs), geographic diversity, and a vaccine introduction with NITAG support. Country case studies were developed, collecting data through desk review and face-to-face key informant interviews (KIIs) from Ministry of Health (MoH) and NITAG. Case studies were analyzed together, to assess governance applying the European Observatory on Health Systems and Policies framework focusing on transparency, accountability, participation, integrity, and policy capacity (TAPIC).ResultsDocument review and 53 KII (22 AR, 20 SA, 11 JO) showed NITAGs played a pivotal role as advisors promoting a culture of evidence-informed policies. NITAGs strengthened governance, although practices varied among countries. Meetings were conducted behind-closed-doors, participation restricted to members, only in one country agendas, and recommendations were public (AR). To increase participation, policy capacity, and transparency, countries considered adding experts in communications, advocacy, and economics. AR and SA contemplated including community members. NITAGs functioned autonomously from the government, with no established internal or external monitoring or supervision. NITAG meeting minutes allowed the review of integrity, adherence to terms of reference, standard operating procedures, and conflict of interest (CoI). For the most part, NITAGs abided by their mandates. Significant issues were related to the level of MoH support and oversight of CoI declaration and documentation.ConclusionsSystematically implementing governance approaches could improve processes, better tailor policies, and implementation. The long-term survival and resilience of NITAGs in these countries showed they play a significant role in strengthening governance. Lessons learned could be useful to those promoting country-driven evidence-informed decision-making. 相似文献
50.