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   860769篇
  免费   71530篇
  国内免费   1838篇
耳鼻咽喉   12800篇
儿科学   24626篇
妇产科学   25114篇
基础医学   124198篇
口腔科学   25484篇
临床医学   75253篇
内科学   164400篇
皮肤病学   16975篇
神经病学   70044篇
特种医学   35190篇
外国民族医学   171篇
外科学   136163篇
综合类   24601篇
现状与发展   2篇
一般理论   263篇
预防医学   66830篇
眼科学   20517篇
药学   64683篇
中国医学   1593篇
肿瘤学   45230篇
  2018年   7337篇
  2015年   7725篇
  2014年   11108篇
  2013年   16777篇
  2012年   22712篇
  2011年   23831篇
  2010年   13864篇
  2009年   13061篇
  2008年   22570篇
  2007年   24618篇
  2006年   24501篇
  2005年   24148篇
  2004年   23707篇
  2003年   22841篇
  2002年   21934篇
  2001年   35829篇
  2000年   36475篇
  1999年   30910篇
  1998年   9226篇
  1997年   8545篇
  1996年   8482篇
  1995年   8015篇
  1994年   7727篇
  1992年   26661篇
  1991年   26100篇
  1990年   25626篇
  1989年   24679篇
  1988年   23224篇
  1987年   22884篇
  1986年   21743篇
  1985年   21103篇
  1984年   16388篇
  1983年   13998篇
  1982年   8856篇
  1981年   8203篇
  1980年   7671篇
  1979年   16740篇
  1978年   12118篇
  1977年   10181篇
  1976年   9330篇
  1975年   10149篇
  1974年   12641篇
  1973年   12137篇
  1972年   11540篇
  1971年   10687篇
  1970年   10218篇
  1969年   9909篇
  1968年   8900篇
  1967年   8233篇
  1966年   7654篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
61.
62.
The aim of this study was to analyse the effect of body mass index (BMI), both low and high values, on the perioperative complication rate in patients with oral squamous cell carcinoma (OSCC). The medical records of 259 patients operated between 2014 and 2017 for OSCC were reviewed. Univariate and multivariate analyses were performed. Sixty of the 259 patients developed 87 complications. Low or high BMI was not associated with the perioperative complication rate. A longer operating time and increased blood loss were associated with a higher perioperative complication rate and higher Clavien–Dindo grade. Low BMI, American Society of Anesthesiologists score 2 and 3, a longer operating time, and increased blood loss were associated with a longer hospital stay. Low BMI was associated with a longer hospital stay. Neither low nor high BMI was associated with the perioperative complication rate. A longer operating time and increased blood loss were associated with a higher perioperative complication rate and higher Clavien–Dindo grade.  相似文献   
63.
64.
65.
Unpredictable hypertrophic scarring (HS) occurs after approximately 35% of all surgical procedures and causes significant physical and psychological complaints. Parallel to the need to understanding the mechanisms underlying HS formation, a prognostic tool is needed. The objective was to determine whether (systemic) immunological differences exist between patients who develop HS and those who develop normotrophic scars (NS) and to assess whether those differences can be used to identify patients prone to developing HS. A prospective cohort study with NS and HS groups in which (a) cytokine release by peripheral blood mononuclear cells (PBMC) and (b) the irritation threshold (IT) after an irritant (sodium lauryl sulphate) patch test was evaluated. Univariate regression analysis of PBMC cytokine secretion showed that low MCP‐1, IL‐8, IL‐18 and IL‐23 levels have a strong correlation with HS (P < .010‐0.004; AUC = 0.790‐0.883). Notably, combinations of two or three cytokines (TNF‐a, MCP‐1 and IL‐23; AUC: 0.942, Nagelkerke R2: 0.727) showed an improved AUC indicating a better correlation with HS than single cytokine analysis. These combination models produce good prognostic results over a broad probability range (sensitivity: 93.8%, specificity 86.7%, accuracy 90,25% between probability 0.3 and 0.7). Furthermore, the HS group had a lower IT than the NS group and an accuracy of 68%. In conclusion, very fundamental immunological differences exist between individuals who develop HS and those who do not, whereas the cytokine assay forms the basis of a predictive prognostic test for HS formation, the less invasive, easily performed irritant skin patch test is more accessible for daily practice.  相似文献   
66.
67.
68.
International Journal of Clinical Pharmacy - Background Drug-related problems (DRP) following hospital discharge may cause morbidity, mortality and hospital re-admissions. It is unclear whether a...  相似文献   
69.
70.
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