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   862202篇
  免费   71589篇
  国内免费   1844篇
耳鼻咽喉   12813篇
儿科学   24656篇
妇产科学   25138篇
基础医学   124373篇
口腔科学   25491篇
临床医学   75399篇
内科学   164722篇
皮肤病学   17021篇
神经病学   70251篇
特种医学   35227篇
外国民族医学   171篇
外科学   136310篇
综合类   24604篇
现状与发展   2篇
一般理论   263篇
预防医学   66955篇
眼科学   20550篇
药学   64757篇
中国医学   1594篇
肿瘤学   45338篇
  2018年   7361篇
  2015年   7740篇
  2014年   11139篇
  2013年   16817篇
  2012年   22777篇
  2011年   23897篇
  2010年   13908篇
  2009年   13106篇
  2008年   22638篇
  2007年   24675篇
  2006年   24537篇
  2005年   24187篇
  2004年   23765篇
  2003年   22876篇
  2002年   21973篇
  2001年   35873篇
  2000年   36519篇
  1999年   30938篇
  1998年   9237篇
  1997年   8560篇
  1996年   8480篇
  1995年   8012篇
  1994年   7728篇
  1992年   26686篇
  1991年   26112篇
  1990年   25635篇
  1989年   24699篇
  1988年   23232篇
  1987年   22898篇
  1986年   21750篇
  1985年   21115篇
  1984年   16400篇
  1983年   14005篇
  1982年   8863篇
  1981年   8209篇
  1980年   7675篇
  1979年   16754篇
  1978年   12120篇
  1977年   10198篇
  1976年   9334篇
  1975年   10160篇
  1974年   12645篇
  1973年   12144篇
  1972年   11541篇
  1971年   10691篇
  1970年   10223篇
  1969年   9913篇
  1968年   8905篇
  1967年   8235篇
  1966年   7660篇
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
61.
62.
63.
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   
64.
65.
66.
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   
67.
68.
69.
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   
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