全文获取类型
收费全文 | 1744111篇 |
免费 | 140947篇 |
国内免费 | 3175篇 |
专业分类
耳鼻咽喉 | 23350篇 |
儿科学 | 56338篇 |
妇产科学 | 48475篇 |
基础医学 | 246450篇 |
口腔科学 | 50208篇 |
临床医学 | 155353篇 |
内科学 | 344503篇 |
皮肤病学 | 37022篇 |
神经病学 | 143319篇 |
特种医学 | 70872篇 |
外国民族医学 | 494篇 |
外科学 | 266605篇 |
综合类 | 41455篇 |
现状与发展 | 3篇 |
一般理论 | 650篇 |
预防医学 | 133865篇 |
眼科学 | 39400篇 |
药学 | 130311篇 |
4篇 | |
中国医学 | 3200篇 |
肿瘤学 | 96356篇 |
出版年
2018年 | 18073篇 |
2017年 | 14260篇 |
2016年 | 15782篇 |
2015年 | 18286篇 |
2014年 | 25332篇 |
2013年 | 37679篇 |
2012年 | 51989篇 |
2011年 | 54863篇 |
2010年 | 32135篇 |
2009年 | 30798篇 |
2008年 | 51902篇 |
2007年 | 54616篇 |
2006年 | 55299篇 |
2005年 | 53943篇 |
2004年 | 52507篇 |
2003年 | 50018篇 |
2002年 | 48797篇 |
2001年 | 77409篇 |
2000年 | 79754篇 |
1999年 | 68139篇 |
1998年 | 19446篇 |
1997年 | 17747篇 |
1996年 | 17516篇 |
1995年 | 17112篇 |
1994年 | 16039篇 |
1993年 | 15096篇 |
1992年 | 56432篇 |
1991年 | 54679篇 |
1990年 | 53339篇 |
1989年 | 51564篇 |
1988年 | 47895篇 |
1987年 | 47232篇 |
1986年 | 44950篇 |
1985年 | 43511篇 |
1984年 | 32742篇 |
1983年 | 28193篇 |
1982年 | 16932篇 |
1981年 | 15144篇 |
1980年 | 14169篇 |
1979年 | 30949篇 |
1978年 | 21585篇 |
1977年 | 18203篇 |
1976年 | 17092篇 |
1975年 | 17924篇 |
1974年 | 21903篇 |
1973年 | 21025篇 |
1972年 | 19194篇 |
1971年 | 18016篇 |
1970年 | 16525篇 |
1969年 | 15465篇 |
排序方式: 共有10000条查询结果,搜索用时 140 毫秒
81.
AIMS: To establish all-cause and cause-specific death rates, and risk factors for mortality in insulin-treated diabetic individuals living in the province of Canterbury, New Zealand. METHODS: Insulin-treated diabetic subjects (n = 995) on the Canterbury Diabetes Registry were followed up over 15 years and vital status determined. Death rates were standardized and hazard regression was used to model the effects of demographic covariates on relative survival time. RESULTS: There were 419 deaths in 11 226.3 person-years of follow-up with a standardized mortality ratio (SMR) of 2.0 (95% confidence interval (CI) 1.8-2.2). Relative mortality was greatest for the group aged 0-29 years (SMR 3.0 (95% CI 2.4-3.7)). After controlling for diabetes duration and gender, a 10-year increment in age of onset was associated with a 33% decrease in relative hazard (95% CI 29-36%), indicating that excess mortality due to diabetes declines with rising age of onset. After controlling for age of onset and gender, each 10-year increment in duration of diabetes is associated with a 26% decrease in relative hazard (95% CI 24-29%), indicating that with longer survival the mortality hazard approaches the general population hazard. Relative mortalities were increased for cardiovascular, renal and respiratory disease, but not malignancy. Relative mortality from acute metabolic complications was increased in the subgroup with age of onset of diabetes < 30 years and requiring insulin within 1 year of diagnosis. CONCLUSIONS: Mortality rates are high for insulin-treated diabetic individuals relative to the general population. 相似文献
82.
D Gröne† R Treudler† EM de Villiers‡ R Husak† CE Orfanos† ChC Zouboulis†§ 《Journal of the European Academy of Dermatology and Venereology》2006,20(2):202-205
Cidofovir is an acyclic nucleoside phosphonate with broad-spectrum activity against DNA viruses, including human papilloma virus (HPV). However, data on the efficacy of cidofovir in an immunosuppressive setting remain contradictory. We report for the first time on the promotion of the healing of recalcitrant warts in a patient with myelodysplastic syndrome with intravenous cidofovir treatment. 相似文献
83.
S Chinn S H Downs J M Anto M W Gerbase B Leynaert R de Marco C Janson D Jarvis N Künzli J Sunyer C Svanes E Zemp U Ackermann-Liebrich P Burney 《The European respiratory journal》2006,28(4):763-771
The incidence of asthma has been reported to be associated with obesity. An alternative analysis, of net change in prevalence, does not require exclusion of those with asthma at baseline. Follow-up data were obtained from 9,552 participants in the European Community Respiratory Health Survey and the Swiss cohort Study on Air Pollution and Lung Disease in Adults. Incidence of asthma was analysed by proportional hazards regression, and net changes in symptoms and asthma status by generalised estimating equations, by obesity group. Incidence and net change in ever having had asthma were greater in females than in males, and in participants who remained obese compared with those who were never obese (hazard ratio 2.00, 95% confidence interval 1.25-3.20; excess net change 2.8%, 0.4-5.3% per 10 yrs). The effect of being obese on net change in diagnosed asthma was greater in females than in males, but for net change in wheeze without a cold it was greater in males. The present results are consistent with asthma being more frequently diagnosed in females, especially obese females. These findings may help to explain the reports of a stronger association between asthma and obesity in females than in males. 相似文献
84.
85.
86.
87.
88.
Jennifer Tuboku-Metzger Blakely Ronda L Sinkowitz-Cochran William R Jarvis 《Infection control and hospital epidemiology》2006,27(8):873-875
A 19-item survey instrument was designed and mailed by the Infectious Diseases Society of America to its membership to determine the media preferred by infectious diseases physicians for continuing medical education on general topics and on antimicrobial resistance. The objective of the survey was to offer the developers of educational programs knowledge on which to base more-effective ways to deliver educational materials to physicians in this specialty. 相似文献
89.
Henk R Franke F Froukje Snaaijer Paul W H Houben Marius J van der Mooren 《Gynecological endocrinology》2006,22(12):692-697
OBJECTIVE: To assess the effects of adding combined estradiol/norethisterone acetate therapy (CENT) to goserelin acetate treatment (GA) of dysfunctional uterine bleeding (DUB) in perimenopausal women. METHODS: In a randomized, placebo-controlled, double-blind trial followed by an open follow-up study, 31 perimenopausal women with DUB were recruited from gynecological outpatient departments of two Dutch hospitals and randomized for treatment with either GA/placebo or GA/CENT for 6 months followed by 18 months of GA/CENT for all. The main outcome measures were abdominal pain, number of bleeding days, double-layer endometrial thickness (DET), Greene climacteric score (GCS), visual analog scale for well-being, bone mineral density (BMD) and mammographic density (BI-RAD score). RESULTS: Abdominal pain, number of bleeding days and DET decreased in both groups, the between-group difference in decrease not being statistically significant. GCS initially showed significant improvement in the GA/CENT group. BMD decreased significantly in the GA/placebo group (-4.1%) compared with the GA/CENT group (-0.3%). Another 18 months of GA/CENT did not result in a lasting difference in BMD between groups. BI-RAD scores did not differ significantly between or within the two groups. CONCLUSIONS: Adding CENT to GA treatment for DUB in perimenopausal women initially prevented BMD loss and improved climacteric complaints, while having no negative impact on vaginal bleeding, abdominal pain or BI-RAD scores. However, prolonged treatment did not result in a lasting prevention of bone loss. 相似文献
90.