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   891356篇
  免费   73061篇
  国内免费   1980篇
耳鼻咽喉   13206篇
儿科学   25170篇
妇产科学   25651篇
基础医学   128264篇
口腔科学   26634篇
临床医学   77641篇
内科学   171633篇
皮肤病学   17751篇
神经病学   72323篇
特种医学   36387篇
外国民族医学   171篇
外科学   141152篇
综合类   24803篇
现状与发展   2篇
一般理论   265篇
预防医学   67705篇
眼科学   20988篇
药学   66801篇
中国医学   1637篇
肿瘤学   48213篇
  2018年   7917篇
  2015年   8261篇
  2014年   11829篇
  2013年   17571篇
  2012年   23963篇
  2011年   25171篇
  2010年   14607篇
  2009年   13755篇
  2008年   23789篇
  2007年   25895篇
  2006年   25811篇
  2005年   25495篇
  2004年   25014篇
  2003年   24087篇
  2002年   23191篇
  2001年   36991篇
  2000年   37800篇
  1999年   32066篇
  1998年   9601篇
  1997年   8819篇
  1996年   8764篇
  1995年   8276篇
  1994年   7957篇
  1992年   27429篇
  1991年   26825篇
  1990年   26272篇
  1989年   25351篇
  1988年   23874篇
  1987年   23527篇
  1986年   22406篇
  1985年   21677篇
  1984年   16795篇
  1983年   14341篇
  1982年   9015篇
  1981年   8351篇
  1980年   7798篇
  1979年   17069篇
  1978年   12343篇
  1977年   10380篇
  1976年   9437篇
  1975年   10301篇
  1974年   12839篇
  1973年   12322篇
  1972年   11715篇
  1971年   10871篇
  1970年   10391篇
  1969年   10114篇
  1968年   9061篇
  1967年   8377篇
  1966年   7774篇
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
61.
62.
63.
64.
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   
65.
66.
67.
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   
68.
69.
70.
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   
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