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   4818922篇
  免费   377833篇
  国内免费   15533篇
耳鼻咽喉   67317篇
儿科学   156014篇
妇产科学   127808篇
基础医学   727091篇
口腔科学   133400篇
临床医学   443085篇
内科学   876943篇
皮肤病学   116591篇
神经病学   403478篇
特种医学   187457篇
外国民族医学   1026篇
外科学   722723篇
综合类   135211篇
现状与发展   24篇
一般理论   2809篇
预防医学   401070篇
眼科学   113318篇
药学   342595篇
  27篇
中国医学   12863篇
肿瘤学   241438篇
  2021年   56744篇
  2019年   59309篇
  2018年   75960篇
  2017年   58331篇
  2016年   64613篇
  2015年   77100篇
  2014年   111531篇
  2013年   177439篇
  2012年   137740篇
  2011年   145257篇
  2010年   130301篇
  2009年   130485篇
  2008年   130775篇
  2007年   139998篇
  2006年   147860篇
  2005年   141908篇
  2004年   143120篇
  2003年   132967篇
  2002年   121841篇
  2001年   188934篇
  2000年   185138篇
  1999年   167481篇
  1998年   74715篇
  1997年   69760篇
  1996年   67671篇
  1995年   63143篇
  1994年   57163篇
  1993年   52799篇
  1992年   122630篇
  1991年   117605篇
  1990年   113537篇
  1989年   110430篇
  1988年   101451篇
  1987年   99871篇
  1986年   93984篇
  1985年   91719篇
  1984年   74790篇
  1983年   65956篇
  1982年   50554篇
  1981年   46842篇
  1980年   43732篇
  1979年   64812篇
  1978年   51259篇
  1977年   45212篇
  1976年   41940篇
  1975年   42589篇
  1974年   47215篇
  1973年   45204篇
  1972年   42177篇
  1971年   39085篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
991.
992.
Researchers interested in measuring neighborhood‐level effects should understand how “neighborhood” is defined within nursing sciences and other sciences, and the inherent strengths and weaknesses of current research methodologies. This concept analysis provides clarity around the concept of neighborhood within the context of health, analyzes the current state of development of the neighborhood concept, and proposes areas for future nursing research. Using the Rodger's Method of analysis, the concept of neighborhood within nursing and public health research is described based on existing literature. The concept's attributes, related concepts, antecedents, and consequences are given from the literature. Comparisons of the use of neighborhood are made between nursing, public health, sociology, and other sciences. The evolution of the concept of neighborhood throughout history is described, and important implications for future research are discussed.  相似文献   
993.
994.
995.
996.
997.
998.
999.
Gastroesophageal reflux is the most common benign disorder of the esophagus and laparoscopic Nissen fundoplication has become the standard surgical treatment for its treatment. In our area, where the use of bougie calibration is debatable, postoperative dysphagia is encountered often after this surgery although it is usually not permanent. The aim of this study was to investigate the effect of using a soft silicone tube 39 F in diameter for esophageal calibration during laparoscopic Nissen fundoplication on the incidence of postoperative dysphagia. We divided cases scheduled to undergo laparoscopic Nissen fundoplication between January 2009 and November 2010 into two groups, each consisting 25 patients. Esophageal calibration with a 39 F silicone orogastric tube was used for the first group while there was no operative calibration in the second group. The surgical duration was recorded; the presence and severity of the postoperative dysphagia was calculated by using a dysphagia severity scoring system during the 1-year postoperative follow-up. The dysphagia severity scores were significantly lower in group 1 than group 2 on the postoperative second day and at the end of the first week and first month. We did not find a significant difference at the end of the 6-month and first year. There was also no significant difference regarding surgery duration. The use of a soft orogastric tube 39 F in diameter for esophagus calibration during laparoscopic Nissen fundoplication has significantly decreased the incidence of postoperative transient dysphagia without affecting the duration of surgery. Although dysphagia gradually resolves in the majority of patients, a safe and easy calibration method for its prevention is worth developing, and we believe that the use of our method in larger series could be beneficial.  相似文献   
1000.
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