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   886716篇
  免费   73635篇
  国内免费   1937篇
耳鼻咽喉   13162篇
儿科学   25379篇
妇产科学   25560篇
基础医学   127523篇
口腔科学   26144篇
临床医学   77889篇
内科学   169490篇
皮肤病学   17259篇
神经病学   72566篇
特种医学   36365篇
外国民族医学   171篇
外科学   139943篇
综合类   25126篇
现状与发展   2篇
一般理论   280篇
预防医学   69495篇
眼科学   21404篇
药学   66332篇
中国医学   1634篇
肿瘤学   46564篇
  2018年   7640篇
  2015年   8122篇
  2014年   11712篇
  2013年   17896篇
  2012年   24111篇
  2011年   25368篇
  2010年   14736篇
  2009年   13900篇
  2008年   24015篇
  2007年   26299篇
  2006年   26188篇
  2005年   25813篇
  2004年   25320篇
  2003年   24420篇
  2002年   23578篇
  2001年   36076篇
  2000年   36656篇
  1999年   31204篇
  1998年   9598篇
  1997年   8856篇
  1996年   8770篇
  1995年   8285篇
  1994年   7987篇
  1992年   26861篇
  1991年   26282篇
  1990年   25777篇
  1989年   24864篇
  1988年   23415篇
  1987年   23074篇
  1986年   21932篇
  1985年   21301篇
  1984年   16655篇
  1983年   14270篇
  1982年   9237篇
  1981年   8568篇
  1980年   8034篇
  1979年   16947篇
  1978年   12329篇
  1977年   10410篇
  1976年   9491篇
  1975年   10323篇
  1974年   12820篇
  1973年   12313篇
  1972年   11692篇
  1971年   10776篇
  1970年   10282篇
  1969年   9967篇
  1968年   8956篇
  1967年   8295篇
  1966年   7708篇
排序方式: 共有10000条查询结果,搜索用时 78 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