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   954191篇
  免费   78372篇
  国内免费   2014篇
耳鼻咽喉   13606篇
儿科学   27403篇
妇产科学   26991篇
基础医学   139041篇
口腔科学   27975篇
临床医学   83370篇
内科学   182435篇
皮肤病学   18561篇
神经病学   79503篇
特种医学   38912篇
外国民族医学   180篇
外科学   147506篇
综合类   25030篇
现状与发展   3篇
一般理论   352篇
预防医学   77920篇
眼科学   22100篇
药学   70385篇
中国医学   1764篇
肿瘤学   51540篇
  2018年   9323篇
  2016年   8338篇
  2015年   9762篇
  2014年   13880篇
  2013年   20406篇
  2012年   28239篇
  2011年   29488篇
  2010年   16812篇
  2009年   16174篇
  2008年   27534篇
  2007年   29692篇
  2006年   29440篇
  2005年   28733篇
  2004年   27635篇
  2003年   26536篇
  2002年   25331篇
  2001年   38886篇
  2000年   39495篇
  1999年   33599篇
  1998年   10416篇
  1997年   9533篇
  1996年   9476篇
  1995年   8838篇
  1994年   8494篇
  1992年   28514篇
  1991年   27785篇
  1990年   27255篇
  1989年   26177篇
  1988年   24584篇
  1987年   24078篇
  1986年   22894篇
  1985年   22180篇
  1984年   17191篇
  1983年   14696篇
  1982年   9222篇
  1981年   8524篇
  1980年   7963篇
  1979年   17345篇
  1978年   12511篇
  1977年   10494篇
  1976年   9585篇
  1975年   10398篇
  1974年   12946篇
  1973年   12430篇
  1972年   11826篇
  1971年   10968篇
  1970年   10431篇
  1969年   10114篇
  1968年   9146篇
  1967年   8398篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
71.
72.
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   
73.
74.
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   
75.
76.
77.
78.

Objective

To examine the experience of interracial anxiety among health professionals and how it may affect the quality of their interactions with patients from racially marginalized populations. We explored the influence of prior interracial exposure—specifically through childhood neighborhoods, college student bodies, and friend groups—on interracial anxiety among medical students and residents. We also examined whether levels of interracial anxiety change from medical school through residency.

Data Source

Web-based longitudinal survey data from the Medical Student Cognitive Habits and Growth Evaluation Study.

Study Design

We used a retrospective longitudinal design with four observations for each trainee. The study population consisted of non-Black US medical trainees surveyed in their 1st and 4th years of medical school and 2nd and 3rd years of residency. Mixed effects longitudinal models were used to assess predictors of interracial anxiety and assess changes in interracial anxiety scores over time.

Principal Findings

In total, 3155 non-Black medical trainees were followed for 7 years. Seventy-eight percent grew up in predominantly White neighborhoods. Living in predominantly White neighborhoods and having less racially diverse friends were associated with higher levels of interracial anxiety among medical trainees. Trainees' interracial anxiety scores did not substantially change over time; interracial anxiety was highest in the 1st year of medical school, lowest in the 4th year, and increased slightly during residency.

Conclusions

Neighborhood and friend group composition had independent effects on interracial anxiety, indicating that premedical racial socialization may affect medical trainees' preparedness to interact effectively with diverse patient populations. Additionally, the lack of substantial change in interracial anxiety throughout medical training suggests the importance of providing curricular tools and structure (e.g., instituting interracial cooperative learning activities) to foster the development of healthy interracial relationships.  相似文献   
79.
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   
80.
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