全文获取类型
收费全文 | 35253篇 |
免费 | 1983篇 |
国内免费 | 142篇 |
专业分类
耳鼻咽喉 | 321篇 |
儿科学 | 848篇 |
妇产科学 | 720篇 |
基础医学 | 4426篇 |
口腔科学 | 2049篇 |
临床医学 | 2436篇 |
内科学 | 9184篇 |
皮肤病学 | 885篇 |
神经病学 | 2975篇 |
特种医学 | 714篇 |
外科学 | 4958篇 |
综合类 | 204篇 |
一般理论 | 12篇 |
预防医学 | 2495篇 |
眼科学 | 998篇 |
药学 | 1655篇 |
中国医学 | 146篇 |
肿瘤学 | 2352篇 |
出版年
2023年 | 249篇 |
2022年 | 443篇 |
2021年 | 1205篇 |
2020年 | 678篇 |
2019年 | 1027篇 |
2018年 | 1221篇 |
2017年 | 791篇 |
2016年 | 823篇 |
2015年 | 1057篇 |
2014年 | 1375篇 |
2013年 | 1752篇 |
2012年 | 2838篇 |
2011年 | 3066篇 |
2010年 | 1690篇 |
2009年 | 1483篇 |
2008年 | 2499篇 |
2007年 | 2688篇 |
2006年 | 2412篇 |
2005年 | 2145篇 |
2004年 | 1854篇 |
2003年 | 1682篇 |
2002年 | 1628篇 |
2001年 | 221篇 |
2000年 | 162篇 |
1999年 | 210篇 |
1998年 | 250篇 |
1997年 | 210篇 |
1996年 | 188篇 |
1995年 | 152篇 |
1994年 | 156篇 |
1993年 | 118篇 |
1992年 | 72篇 |
1991年 | 72篇 |
1990年 | 60篇 |
1989年 | 48篇 |
1988年 | 49篇 |
1987年 | 49篇 |
1986年 | 40篇 |
1985年 | 43篇 |
1984年 | 68篇 |
1983年 | 52篇 |
1982年 | 46篇 |
1981年 | 75篇 |
1980年 | 43篇 |
1979年 | 35篇 |
1978年 | 40篇 |
1977年 | 44篇 |
1976年 | 42篇 |
1974年 | 21篇 |
1973年 | 22篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
21.
22.
23.
24.
25.
26.
Eduardo Rodrigues‐Pinto Joel Ferreira‐Silva Guilherme Macedo Douglas K. Rex 《Digestive endoscopy》2019,31(5):583-587
Cecal intubation is a critical aspect of effective, complete colonoscopy. Difficult colonoscopy is most often considered as one in which it is challenging or impossible to reach the cecum. It may be a common occurrence due to patient and/or endoscopist factors. Incomplete colonoscopies should be avoided, since patients in this context present an important prevalence of lesions that escape examination. The approach to successful cecal intubation should depend on characterization of the problem as redundant colon or difficult sigmoid colon. Most patients with a prior incomplete colonoscopy can be colonoscoped successfully, if careful attention is paid to technique, using a variety of scopes, colonoscopy methods and additional equipment. Sufficient time should be allotted to make the attempt. 相似文献
27.
28.
José Roberto Jurado Jorge Hernán Santos Nieto Jairo Ospina Gaitán Constanza Garzón Bonilla Ricardo Villarreal David Acevedo Laura Cabrera Luis Felipe Cabrera Mauricio Pedraza 《Arab Journal Of Gastroenterology》2021,22(2):170-173
Background and study aimsThe COVID-19 outbreak has reorganized surgical team conditions regarding endoscopy. The number of interventions has been reduced, the number of healthcare professionals must be limited, and both the patients and physicians are more protected than ever.Patients and MethodsIn the highest peak of contagion in Colombia, endoscopy, colonoscopy, and esophagogastroduodenoscopy were performed using a low-cost disposable device. A total of 1388 procedures were performed. Every patient was assessed for symptoms via a telephone call, at the health center, and after the procedure, following specific attention routes.ResultsAfter procedure follow-up, no positive cases of COVID-19 were noted.ConclusionThe methodology reduced the risk of infection during the COVID-19 pandemic. 相似文献
29.
30.
Jorge Cano Julián Campo Luis A Moreno Antonio Bascones 《Oral surgery, oral medicine, oral pathology, oral radiology, and endodontics》2006,101(1):11-28
OBJECTIVE: Alveolar distraction is a relatively novel procedure by which alveolar bone and underlying mucosa are regenerated. The low predictability of other vertical or horizontal bone regeneration methods has increased interest in this promising technique. This article was designed to review published clinical and experimental results on alveolar distraction, including basic research in other disciplines (maxillofacial and orthopedic distraction) related to or with influence on alveolar distraction. STUDY DESIGN: A review of the international literature was performed to summarize results of clinical and experimental studies on alveolar distraction and on distraction at other anatomical sites that contribute important findings on tissue biology, molecular mechanisms, and other factors that influence and participate in the alveolar distraction process. RESULTS: Research into alveolar distraction has addressed the latency phase, distraction phase, and consolidation phase, yielding highly variable results. Little experimental research has been carried out on this procedure, and most publications are clinical studies with a short follow-up period. Published studies have reported a high rate of complications, attributable to our current lack of understanding of the process. CONCLUSIONS: Definitive conclusions on alveolar distraction are hampered by the lack of clinical and experimental studies to date. Greater knowledge of the factors that influence the distraction process will lead to a more predictable and efficacious distraction technique and a better distractor design. 相似文献