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   862799篇
  免费   71667篇
  国内免费   1840篇
耳鼻咽喉   12806篇
儿科学   24673篇
妇产科学   25142篇
基础医学   124474篇
口腔科学   25503篇
临床医学   75536篇
内科学   164856篇
皮肤病学   16992篇
神经病学   70408篇
特种医学   35284篇
外国民族医学   171篇
外科学   136352篇
综合类   24614篇
现状与发展   2篇
一般理论   264篇
预防医学   66998篇
眼科学   20571篇
药学   64754篇
中国医学   1593篇
肿瘤学   45313篇
  2018年   7382篇
  2015年   7752篇
  2014年   11165篇
  2013年   16874篇
  2012年   22822篇
  2011年   23934篇
  2010年   13916篇
  2009年   13118篇
  2008年   22687篇
  2007年   24733篇
  2006年   24614篇
  2005年   24247篇
  2004年   23793篇
  2003年   22926篇
  2002年   21999篇
  2001年   35889篇
  2000年   36533篇
  1999年   30958篇
  1998年   9241篇
  1997年   8568篇
  1996年   8493篇
  1995年   8025篇
  1994年   7740篇
  1992年   26698篇
  1991年   26136篇
  1990年   25651篇
  1989年   24709篇
  1988年   23263篇
  1987年   22919篇
  1986年   21776篇
  1985年   21117篇
  1984年   16410篇
  1983年   14015篇
  1982年   8865篇
  1981年   8208篇
  1980年   7678篇
  1979年   16751篇
  1978年   12125篇
  1977年   10190篇
  1976年   9335篇
  1975年   10165篇
  1974年   12647篇
  1973年   12147篇
  1972年   11547篇
  1971年   10699篇
  1970年   10227篇
  1969年   9918篇
  1968年   8910篇
  1967年   8236篇
  1966年   7657篇
排序方式: 共有10000条查询结果,搜索用时 31 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