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   861025篇
  免费   71651篇
  国内免费   1838篇
耳鼻咽喉   12806篇
儿科学   24695篇
妇产科学   25130篇
基础医学   124156篇
口腔科学   25542篇
临床医学   75245篇
内科学   164197篇
皮肤病学   16975篇
神经病学   70178篇
特种医学   35231篇
外国民族医学   171篇
外科学   136163篇
综合类   24624篇
现状与发展   2篇
一般理论   266篇
预防医学   66906篇
眼科学   20513篇
药学   64871篇
中国医学   1596篇
肿瘤学   45247篇
  2018年   7386篇
  2015年   7784篇
  2014年   11172篇
  2013年   16845篇
  2012年   22816篇
  2011年   23923篇
  2010年   13924篇
  2009年   13099篇
  2008年   22669篇
  2007年   24700篇
  2006年   24552篇
  2005年   24234篇
  2004年   23790篇
  2003年   22918篇
  2002年   22021篇
  2001年   35888篇
  2000年   36528篇
  1999年   30947篇
  1998年   9245篇
  1997年   8564篇
  1996年   8495篇
  1995年   8025篇
  1994年   7737篇
  1992年   26698篇
  1991年   26149篇
  1990年   25644篇
  1989年   24704篇
  1988年   23224篇
  1987年   22879篇
  1986年   21739篇
  1985年   21106篇
  1984年   16369篇
  1983年   13970篇
  1982年   8837篇
  1981年   8168篇
  1980年   7637篇
  1979年   16710篇
  1978年   12092篇
  1977年   10146篇
  1976年   9304篇
  1975年   10120篇
  1974年   12626篇
  1973年   12132篇
  1972年   11537篇
  1971年   10676篇
  1970年   10204篇
  1969年   9908篇
  1968年   8895篇
  1967年   8220篇
  1966年   7646篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
71.
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   
72.
73.
74.
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   
75.
76.
77.
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   
78.
79.
80.
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