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   2600208篇
  免费   185588篇
  国内免费   7576篇
耳鼻咽喉   34355篇
儿科学   85551篇
妇产科学   71808篇
基础医学   365159篇
口腔科学   69870篇
临床医学   236000篇
内科学   517356篇
皮肤病学   62584篇
神经病学   214928篇
特种医学   100365篇
外国民族医学   741篇
外科学   387915篇
综合类   50710篇
现状与发展   6篇
一般理论   994篇
预防医学   197756篇
眼科学   57061篇
药学   189026篇
  8篇
中国医学   5350篇
肿瘤学   145829篇
  2021年   20143篇
  2019年   20802篇
  2018年   29504篇
  2017年   22781篇
  2016年   26437篇
  2015年   29725篇
  2014年   40736篇
  2013年   60854篇
  2012年   80859篇
  2011年   85148篇
  2010年   51373篇
  2009年   49457篇
  2008年   79638篇
  2007年   84487篇
  2006年   86169篇
  2005年   82386篇
  2004年   79334篇
  2003年   76599篇
  2002年   73866篇
  2001年   128659篇
  2000年   131644篇
  1999年   110751篇
  1998年   31398篇
  1997年   28055篇
  1996年   28362篇
  1995年   27474篇
  1994年   25155篇
  1993年   23517篇
  1992年   85373篇
  1991年   81780篇
  1990年   79049篇
  1989年   76246篇
  1988年   69650篇
  1987年   68166篇
  1986年   63692篇
  1985年   60668篇
  1984年   45069篇
  1983年   38085篇
  1982年   22556篇
  1981年   20092篇
  1979年   39108篇
  1978年   27545篇
  1977年   23334篇
  1976年   21552篇
  1975年   22886篇
  1974年   26871篇
  1973年   25446篇
  1972年   23817篇
  1971年   22019篇
  1970年   20249篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
1.
2.
3.
BackgroundThe aim of this study was to estimate the prevalence of dental prosthetic treatment and to investigate the demographic, social, economic and medical factors associated with the use of fixed and removable dentures in a representative sample of adults living in France.MethodsThe data were obtained from the 2002–2003 Decennial Health Survey, a cross-sectional study of a representative sample of the population living in France, which included 29,679 adults. Information was collected by interview. The variables collected were fixed denture, removable denture, age, gender, number of children, area of residence, nationality, educational attainment, family social status, employment status, annual household income per capita, supplementary insurance, chronic disease, eyesight problems/glasses, hearing problems/hearing aids. Multinomial logistic regression models were used to study the relationship between prosthetic treatment and demographic, socioeconomic and medical characteristics unadjusted, adjusted for age and adjusted for all the characteristics.ResultsThe prevalence of prosthetic treatment was 34.6% (95% confidence interval (CI): [34.1; 35.2]) for fixed prosthetic dentures and 13.8% (95% CI: [13.4; 14.2]) for removable prosthetic dentures. We showed a gradient between educational attainment and removable dentures; the odds ratio adjusted for all the variables (aOR) associated with no or primary education compared to post-secondary education was 2.56; 95% CI: [2.09; 3.13]. When annual household income per capita was low, subjects were less likely to report fixed dentures (aOR = 0.68; 95% CI: [0.62; 0.75]) than those with high annual household income per capita. Individuals without insurance less often reported fixed dentures than those with private insurance. Those reporting chronic disease were less likely to report fixed dentures (aOR = 0.87; 95% CI: [0.79; 0.95]) but more likely to report removable dentures (aOR = 1.29; 95% CI: [1.17; 1.43]) than those without chronic disease.ConclusionThis study reveals social, economic and medical inequalities in fixed and removable prosthetic treatment among adults in France.  相似文献   
4.
5.
6.
7.
8.
Pharmaceutical Chemistry Journal - An HPLC-MS method for simultaneous quantitative determination of a novel gestagenic pharmaceutical and two of its metabolites in rat and rabbit blood sera was...  相似文献   
9.
10.
To determine percent of patients without malignancy and ≤ 40 years of age with high cumulative radiation doses through recurrent CT exams and assess imaging appropriateness. From the cohort of patients who received cumulative effective dose (CED) of ≥ 100 mSv over a 5-year period, a sub-set was identified with non-malignant disease. The top 50 clinical indications leading to multiple CTs were determined. Clinical decision support (CDS) system scores were analyzed using a widely adopted standard of 1–3 (red) as “not usually appropriate,” 4–6 (yellow) “may or may not be appropriate,” and 7–9 (green) “usually appropriate.” Clinicians reviewed patient records to assess compliance with appropriate use criteria (AUC). 9.6% of patients in our series were with non-malignant conditions and 1.4% with age ≤ 40 years. CDS scores (rounded) were 2% red, 38% yellow, 27% green, and 33% unscored CTs. Clinical society guidelines for CT exams, wherever available, were followed in 87.5 to 100% of cases. AUCs were not available for several clinical indications as also referral guidelines for serial CT imaging. More than half of CT exams were unrelated to follow-up of a primary chronic disease. We are faced with a situation wherein patients in age ≤ 40 years require or are thought to require many CT exams over the course of a few years but the radiation risk creates concern. There is a fair number of conditions for which AUC are not available. Suggested solutions include development of CT scanners with lesser radiation dose and further development of appropriateness criteria.  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