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   1099612篇
  免费   75239篇
  国内免费   1797篇
耳鼻咽喉   15598篇
儿科学   35014篇
妇产科学   29211篇
基础医学   157206篇
口腔科学   29983篇
临床医学   97013篇
内科学   209561篇
皮肤病学   25289篇
神经病学   83257篇
特种医学   44332篇
外国民族医学   201篇
外科学   166682篇
综合类   22067篇
现状与发展   1篇
一般理论   277篇
预防医学   75585篇
眼科学   25330篇
药学   88453篇
  7篇
中国医学   3126篇
肿瘤学   68455篇
  2021年   8479篇
  2019年   8502篇
  2018年   12160篇
  2017年   9547篇
  2016年   10957篇
  2015年   12441篇
  2014年   16633篇
  2013年   23757篇
  2012年   32810篇
  2011年   34590篇
  2010年   20362篇
  2009年   19008篇
  2008年   31630篇
  2007年   33613篇
  2006年   34083篇
  2005年   32356篇
  2004年   30819篇
  2003年   29594篇
  2002年   28492篇
  2001年   60513篇
  2000年   61924篇
  1999年   51342篇
  1998年   12638篇
  1997年   11172篇
  1996年   11149篇
  1995年   10446篇
  1994年   9447篇
  1993年   8935篇
  1992年   37986篇
  1991年   36428篇
  1990年   35891篇
  1989年   34433篇
  1988年   31018篇
  1987年   30089篇
  1986年   28325篇
  1985年   26559篇
  1984年   19284篇
  1983年   16193篇
  1982年   8871篇
  1979年   17103篇
  1978年   11458篇
  1977年   10275篇
  1976年   8866篇
  1975年   10111篇
  1974年   11690篇
  1973年   11305篇
  1972年   10786篇
  1971年   10121篇
  1970年   9280篇
  1969年   8955篇
排序方式: 共有10000条查询结果,搜索用时 218 毫秒
1.
2.
Quality of Life Research - The COVID-19 pandemic might add to the stressors experienced by people living with rheumatic diseases. This study aimed to examine rheumatic patients’ functional...  相似文献   
3.
Molnár  B.  Aroca  S.  Dobos  A.  Orbán  K.  Szabó  J.  Windisch  P.  Stähli  A.  Sculean  A. 《Clinical oral investigations》2022,26(12):7135-7142
Clinical Oral Investigations - To evaluate t he long-term outcomes following treatment of RT 1 multiple adjacent gingival recessions (MAGR) using the modified coronally advanced tunnel (MCAT) with...  相似文献   
4.
5.
6.
7.
8.
Inflammatory bowel disease (IBD) is a chronic disease that requires chronic treatment throughout the evolution of the disease, with a complex physiopathology that entails great challenges for the development of new and specific treatments for ulcerative colitis and Crohn´s disease. The anti-tumor necrosis factor alpha therapy has impacted the clinical course of IBD in those patients who do not respond to conventional treatment, so there is a need to develop new therapies and markers of treatment response. Various pathways involved in the development of the disease are known and the new therapies have focused on blocking the inflammatory process at the gastrointestinal level by oral, intravenous, subcutaneous, and topical route. All these new therapies can lead to more personalized treatments with higher success rates and fewer relapses. These treatments have not only focused on clinical remission, but also on achieving macroscopic changes at the endoscopic level and microscopic changes by achieving mucosal healing. These treatments are mainly based on modifying signaling pathways, by blocking receptors or ligands, reducing cell migration and maintaining the integrity of the epithelial barrier. Therefore, this review presents the efficacy and safety of the new treatments that are currently under study and the advances that have been made in this area in recent years.  相似文献   
9.
10.
Barrett's esophagus (BE) is the precursor to esophageal adenocarcinoma (EAC). Progression to cancer typically occurs in a stepwise fashion through worsening dysplasia and ultimately, invasive neoplasia. Established EAC with deep involvement of the esophageal wall and/or metastatic disease is invariably associated with poor long-term survival rates. This guides the rationale of surveillance of Barrett’s in an attempt to treat lesions at an earlier, and potentially curative stage. The last two decades have seen a paradigm shift in management of Barrett’s with rapid expansion in the role of endoscopic eradication therapy (EET) for management of dysplastic and early neoplastic BE, and there have been substantial changes to international consensus guidelines for management of early BE based on evolving evidence. This review aims to assist the physician in the therapeutic decision-making process with patients by comprehensive review and summary of literature surrounding natural history of Barrett’s by histological stage, and the effectiveness of interventions in attenuating the risk posed by its natural history. Key findings were as follows. Non-dysplastic Barrett’s is associated with extremely low risk of progression, and interventions cannot be justified. The annual risk of cancer progression in low grade dysplasia is between 1%-3%; EET can be offered though evidence for its benefit remains confined to highly select settings. High-grade dysplasia progresses to cancer in 5%-10% per year; EET is similarly effective to and less morbid than surgery and should be routinely performed for this indication. Risk of nodal metastases in intramucosal cancer is 2%-4%, which is comparable to operative mortality rate, so EET is usually preferred. Submucosal cancer is associated with nodal metastases in 14%-41% hence surgery remains standard of care, except for select situations.  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