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   1029753篇
  免费   83530篇
  国内免费   2555篇
耳鼻咽喉   14918篇
儿科学   29139篇
妇产科学   28575篇
基础医学   147645篇
口腔科学   29487篇
临床医学   91964篇
内科学   198435篇
皮肤病学   19278篇
神经病学   85131篇
特种医学   42081篇
外国民族医学   211篇
外科学   161415篇
综合类   26723篇
现状与发展   3篇
一般理论   499篇
预防医学   81724篇
眼科学   24119篇
药学   76757篇
  2篇
中国医学   1904篇
肿瘤学   55828篇
  2018年   10846篇
  2016年   9295篇
  2015年   11045篇
  2014年   15702篇
  2013年   24052篇
  2012年   32865篇
  2011年   34638篇
  2010年   20277篇
  2009年   18823篇
  2008年   32191篇
  2007年   34819篇
  2006年   34408篇
  2005年   34044篇
  2004年   33251篇
  2003年   31700篇
  2002年   30708篇
  2001年   38596篇
  2000年   39037篇
  1999年   33705篇
  1998年   11367篇
  1997年   10224篇
  1996年   10060篇
  1995年   9557篇
  1994年   9038篇
  1993年   8588篇
  1992年   28496篇
  1991年   27910篇
  1990年   27272篇
  1989年   26347篇
  1988年   24718篇
  1987年   24387篇
  1986年   23206篇
  1985年   22530篇
  1984年   17711篇
  1983年   15220篇
  1982年   10164篇
  1981年   9547篇
  1980年   8770篇
  1979年   17733篇
  1978年   12927篇
  1977年   10940篇
  1976年   9995篇
  1975年   10817篇
  1974年   13363篇
  1973年   12792篇
  1972年   12058篇
  1971年   11174篇
  1970年   10649篇
  1969年   10251篇
  1968年   9194篇
排序方式: 共有10000条查询结果,搜索用时 859 毫秒
81.
82.
83.
Clinical Oral Investigations - The aim of this study was the analysis of WNT10A variants in seven families of probands with various forms of tooth agenesis and self-reported family history of...  相似文献   
84.
85.
86.

Background Context

Low back pain (LBP) is a common complaint in clinical practice of multifactorial origin. Although obesity has been thought to contribute to LBP primarily by altering the distribution of mechanical loads on the spine, the additional contribution of obesity-related conditions such as diabetes mellitus (DM) to LBP has not been thoroughly examined.

Purpose

To determine if there is a relationship between DM and LBP that is independent of body mass index (BMI) in a large cohort of adult survey participants.

Study Design

Retrospective analysis of prospectively collected National Health and Nutrition Examination Survey (NHANES) data to characterize associations between LBP, DM, and BMI in adults subdivided into 6 subpopulations: normal weight (BMI 18.5–25), overweight (BMI 25–30), and obese (BMI >30) diabetics and nondiabetics. Diabetes was defined with glycohemoglobin A1c (HbA1c) 6.5%.

Patient Sample

11,756 participants from NHANES cohort.

Outcome Measures

Percentage of LBP reported.

Methods

LBP reported in the 1999-2004 miscellaneous pain NHANES questionnaire was the dependent variable examined. Covariates included HbA1c, BMI, age, and family income ratio to poverty as continuous variables as well as race, gender, and smoking as binary variables. Individuals were further subdivided by weight class and diabetes status. Regression and graphical analyses were performed on the study population as a whole and also on subpopulations.

Results

Increasing HbA1c did not increase the odds of reporting LBP in the full cohort. However, multivariate logistic regression of the 6 subpopulations revealed that the odds of LBP significantly increased with increasing HbA1c levels in normal weight diabetics. No other subpopulations reported significant relationships between LBP and HbA1c. LBP was also significantly associated with BMI for normal weight diabetics and also for obese subjects regardless of their DM status.

Conclusions

LBP is significantly related to DM status, but this relationship is complex and may interact with BMI. These results support the concept that LBP may be improved in normal weight diabetic subjects with improved glycemic control and weight loss, and that all obese LBP subjects may benefit from improved weight loss alone.  相似文献   
87.
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   
88.
89.
90.
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