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   863427篇
  免费   71718篇
  国内免费   1838篇
耳鼻咽喉   12865篇
儿科学   24680篇
妇产科学   25149篇
基础医学   124596篇
口腔科学   25508篇
临床医学   75501篇
内科学   164795篇
皮肤病学   17074篇
神经病学   70525篇
特种医学   35443篇
外国民族医学   171篇
外科学   136514篇
综合类   24614篇
现状与发展   2篇
一般理论   263篇
预防医学   66919篇
眼科学   20640篇
药学   64793篇
中国医学   1593篇
肿瘤学   45338篇
  2018年   7393篇
  2015年   7804篇
  2014年   11173篇
  2013年   16888篇
  2012年   22858篇
  2011年   23972篇
  2010年   13949篇
  2009年   13133篇
  2008年   22697篇
  2007年   24750篇
  2006年   24606篇
  2005年   24249篇
  2004年   23823篇
  2003年   22939篇
  2002年   22023篇
  2001年   35927篇
  2000年   36552篇
  1999年   30967篇
  1998年   9260篇
  1997年   8583篇
  1996年   8500篇
  1995年   8030篇
  1994年   7740篇
  1992年   26716篇
  1991年   26139篇
  1990年   25658篇
  1989年   24719篇
  1988年   23272篇
  1987年   22921篇
  1986年   21783篇
  1985年   21145篇
  1984年   16410篇
  1983年   14023篇
  1982年   8873篇
  1981年   8219篇
  1980年   7689篇
  1979年   16763篇
  1978年   12122篇
  1977年   10197篇
  1976年   9339篇
  1975年   10166篇
  1974年   12661篇
  1973年   12152篇
  1972年   11555篇
  1971年   10700篇
  1970年   10224篇
  1969年   9919篇
  1968年   8913篇
  1967年   8238篇
  1966年   7663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