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   1424162篇
  免费   99650篇
  国内免费   3296篇
耳鼻咽喉   20708篇
儿科学   42506篇
妇产科学   40163篇
基础医学   198040篇
口腔科学   41421篇
临床医学   121982篇
内科学   279763篇
皮肤病学   31393篇
神经病学   115163篇
特种医学   57100篇
外国民族医学   438篇
外科学   222603篇
综合类   31989篇
现状与发展   6篇
一般理论   560篇
预防医学   99540篇
眼科学   33222篇
药学   105888篇
  4篇
中国医学   3086篇
肿瘤学   81533篇
  2018年   13960篇
  2016年   12325篇
  2015年   13880篇
  2014年   19721篇
  2013年   29414篇
  2012年   39682篇
  2011年   41922篇
  2010年   24778篇
  2009年   23852篇
  2008年   39892篇
  2007年   43217篇
  2006年   43610篇
  2005年   42016篇
  2004年   41016篇
  2003年   39337篇
  2002年   38602篇
  2001年   64339篇
  2000年   65787篇
  1999年   56146篇
  1998年   15713篇
  1997年   14276篇
  1996年   13589篇
  1995年   12831篇
  1994年   11995篇
  1992年   43145篇
  1991年   41610篇
  1990年   40834篇
  1989年   39792篇
  1988年   37198篇
  1987年   36646篇
  1986年   35105篇
  1985年   33337篇
  1984年   25083篇
  1983年   21264篇
  1982年   12939篇
  1981年   11798篇
  1979年   24002篇
  1978年   17173篇
  1977年   14920篇
  1976年   13454篇
  1975年   15320篇
  1974年   18128篇
  1973年   17614篇
  1972年   16849篇
  1971年   15740篇
  1970年   14937篇
  1969年   14375篇
  1968年   13485篇
  1967年   12028篇
  1966年   11272篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
991.
OBJECTIVES: To present a single centers' 7-year experience in the endovascular treatment of acute traumatic lesions of the descending thoracic aorta (ATL of the DTA). MATERIALS & METHODS: Between March 1999 and December 2006, 34 consecutive acute traumatic lesions of the descending aorta (23 men, mean age 44 years) were treated endovascularly. Stentgrafts used were TAG Excluder, Zenith TX2 and Talent. In 23 patients the Left Subclavian Artery (LSA) was covered. Mean procedural duration was 20 to 75 minutes. RESULTS: Exclusion of the rupture site was achieved in all cases with no conversion to open surgery. Overall 30-day mortality was 8.8%. Two patients died on post operative day (pod) 1 and one on pod 22 from cranial injuries. No death or neurological deficit related to the endovascular treatment was reported. Four type I endoleaks required treatment either by balloon reexpansion (n=2) or by additional stentgraft implantation (n=2). In two patients the stentgraft collapsed totally several days postoperatively. Two patients required secondary surgical procedures (iliac access complication and revascularisation of the left subclavian artery n=1). The average follow-up was 43.8 months (1-93 months). No stentgraft related abnormality has been subsequently documented. CONCLUSIONS: The endovascular treatment of ATL of the DTA may offer the best means of therapy in a polytrauma patient.  相似文献   
992.
BACKGROUND: According to the Center for Disease Control and Prevention (CDC), an estimated 30 million people ride horses each year in the United States. Horseback riding related injuries are common, with an estimated 50,000 emergency room visits annually. The popularity of recreational horseback riding has increased in South Florida and the incidence of associated traumatic injuries is a reflection of this. MATERIAL AND METHODS: Retrospective review of patients admitted to a state designated Level I trauma center that sustained horseback riding associated injuries between January 2000 and December 2003. Information extracted from the Trauma Center's data base included demographics, mechanism of injury and toxicology screening. RESULTS: During the review period, twenty-seven patients were identified. There were 12 men and 15 women. The average age was 36 years. The injuries occurred during pleasure riding in 23 patients and thoroughbred related activities in 4 patients. Multiple severe injuries were common and documented in 24 patients. All patients required hospitalization with an average stay of 5 days. Five patients had a positive toxicology screen on admission. No deaths were documented in this review. CONCLUSION: Horseback riding related injuries tends to be serious. Alcohol and recreational drugs may contribute to exacerbate the extent of these injuries. The use of proper protective equipment, instructions for safe riding, and discouraging drug and alcohol use during riding activities should be emphasized.  相似文献   
993.
994.
The Cinderella shoe syndrome specifies a commonly observed, not yet labeled disproportion of footwear and the morphologic conditions of the wearer. Disproportioned shoes and socks are worn–frequently unconsciously–due to personal reasons, fashion trends, misinformation and wrong advice; they can induce severe foot disorders. The Cinderella shoe syndrome has an important significance within the development, the treatment and the recurrence-prophylaxis of foot disorders, as well as in the assessment of possible reasons for recurrence after foot surgery. To recognize it, to treat individual psychologic reasons, to give support in the choice of footwear, to inform about and to change social reasons are all challenges of the foot surgeon.  相似文献   
995.
996.
BACKGROUND: Administrative databases have increasingly been used to assess bariatric surgery outcomes, resulting in policy recommendations about bariatric practice. However, surgical outcomes must be risk adjusted to compare patients of varying potential risk fairly with those to whom the policies will apply. To date, the risk adjustment tools used for database analysis of bariatric surgical outcomes have been those designed for other purposes, and their sensitivity for bariatric outcomes has not been established. METHODS: Bariatric surgical procedures contained in the National Hospital Discharge Summary for 1993-2003 were assembled into a database. The standard set of Elixhauser co-morbidity variables used by the Agency for Healthcare Research and Quality were entered into the database. Those variables that were significantly associated with adverse outcomes were entered into a stepwise-elimination logistic regression equation, yielding a set of variables related to adverse outcomes from bariatric surgery. These were then prospectively applied to another database (the National Inpatient Survey) to determine their sensitivity for predicting outcomes and were compared with the commonly used Charlson score. RESULTS: The variables significantly correlating with bariatric adverse events included chronic pulmonary disease, hypertension, diabetes with chronic complications, fluid and electrolyte disorders, deficiency anemias, and depression. Age and male gender were also signficantly related to adverse events. The c-index (a correlative index, with .5 showing no, and 1, a perfect, relationship) for bariatric surgery mortality with the Charlson index is .52. For the Elixhauser-based system we developed, it is .72. CONCLUSIONS: We have developed a new risk-adjustment tool for bariatric surgery outcomes studies that use administrative databases. Its performance was clearly better than that of the commonly used Charlson co-morbidity score. Bariatric studies that have used the Charlson index should not be considered adequately risk adjusted.  相似文献   
997.
998.
999.
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