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   3367423篇
  免费   250582篇
  国内免费   8830篇
耳鼻咽喉   45577篇
儿科学   110074篇
妇产科学   91803篇
基础医学   473801篇
口腔科学   94262篇
临床医学   308897篇
内科学   661676篇
皮肤病学   77204篇
神经病学   277652篇
特种医学   130946篇
外国民族医学   952篇
外科学   503394篇
综合类   72811篇
现状与发展   5篇
一般理论   1290篇
预防医学   265846篇
眼科学   74805篇
药学   246761篇
  11篇
中国医学   6625篇
肿瘤学   182443篇
  2019年   26109篇
  2018年   36858篇
  2017年   28275篇
  2016年   32547篇
  2015年   36708篇
  2014年   50857篇
  2013年   76831篇
  2012年   101630篇
  2011年   107803篇
  2010年   64959篇
  2009年   62201篇
  2008年   100551篇
  2007年   107040篇
  2006年   108843篇
  2005年   104651篇
  2004年   100870篇
  2003年   97281篇
  2002年   93706篇
  2001年   161993篇
  2000年   166415篇
  1999年   140001篇
  1998年   40403篇
  1997年   35939篇
  1996年   36397篇
  1995年   35378篇
  1994年   32644篇
  1993年   30535篇
  1992年   110356篇
  1991年   106557篇
  1990年   103217篇
  1989年   99367篇
  1988年   91289篇
  1987年   89704篇
  1986年   84394篇
  1985年   80649篇
  1984年   60418篇
  1983年   51128篇
  1982年   30391篇
  1981年   27226篇
  1979年   53899篇
  1978年   38298篇
  1977年   32328篇
  1976年   30018篇
  1975年   32037篇
  1974年   38022篇
  1973年   36267篇
  1972年   33873篇
  1971年   31440篇
  1970年   28915篇
  1969年   27509篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
41.
42.
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   
43.
44.
45.
46.
47.
48.
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   
49.
50.
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