全文获取类型
收费全文 | 3345篇 |
免费 | 171篇 |
国内免费 | 44篇 |
专业分类
耳鼻咽喉 | 37篇 |
儿科学 | 113篇 |
妇产科学 | 153篇 |
基础医学 | 417篇 |
口腔科学 | 54篇 |
临床医学 | 273篇 |
内科学 | 762篇 |
皮肤病学 | 141篇 |
神经病学 | 198篇 |
特种医学 | 250篇 |
外国民族医学 | 1篇 |
外科学 | 479篇 |
综合类 | 39篇 |
一般理论 | 1篇 |
预防医学 | 282篇 |
眼科学 | 58篇 |
药学 | 185篇 |
中国医学 | 4篇 |
肿瘤学 | 113篇 |
出版年
2022年 | 28篇 |
2021年 | 60篇 |
2020年 | 41篇 |
2019年 | 68篇 |
2018年 | 75篇 |
2017年 | 47篇 |
2016年 | 56篇 |
2015年 | 66篇 |
2014年 | 79篇 |
2013年 | 166篇 |
2012年 | 128篇 |
2011年 | 139篇 |
2010年 | 132篇 |
2009年 | 123篇 |
2008年 | 130篇 |
2007年 | 128篇 |
2006年 | 155篇 |
2005年 | 124篇 |
2004年 | 97篇 |
2003年 | 86篇 |
2002年 | 104篇 |
2001年 | 83篇 |
2000年 | 88篇 |
1999年 | 78篇 |
1998年 | 91篇 |
1997年 | 79篇 |
1996年 | 85篇 |
1995年 | 59篇 |
1994年 | 74篇 |
1993年 | 59篇 |
1992年 | 45篇 |
1991年 | 44篇 |
1990年 | 49篇 |
1989年 | 65篇 |
1988年 | 66篇 |
1987年 | 48篇 |
1986年 | 47篇 |
1985年 | 53篇 |
1984年 | 39篇 |
1983年 | 25篇 |
1982年 | 30篇 |
1981年 | 20篇 |
1980年 | 22篇 |
1979年 | 22篇 |
1978年 | 19篇 |
1977年 | 21篇 |
1976年 | 19篇 |
1975年 | 21篇 |
1974年 | 23篇 |
1973年 | 27篇 |
排序方式: 共有3560条查询结果,搜索用时 15 毫秒
81.
Spindler A Bellomio V Berman A Lucero E Baigorria M Paz S Garrone N Torres AI Romano O Carraccio A Leal O Bazzano A Vazquez D Pera O Arquez G Valdez M Lazaro H Rengel S Acosta E Santana M 《The Journal of rheumatology》2002,29(6):1166-1170
OBJECTIVE: To ascertain the prevalence of rheumatoid arthritis (RA) in Tucumán, Argentina. METHODS: The study was conducted between January 1, 1998, and December 31, 1999, in Tucumán province in northwest Argentina. Outpatient and hospitalization medical records for all patients with RA aged > or = 16 years were reviewed. Diagnosis was by 1987 American College of Rheumatology (ACR) criteria for RA and the population data were based on the 1991 national census. Prevalence rates, with 95% CI, were calculated using the number of San Miguel de Tucumán residents who fulfilled the 1987 ACR criteria for RA as numerator, and the city population aged > or = 16 as denominator. Crude and age-specific prevalence rates were calculated as number of cases/1,000 inhabitants. RESULTS: We identified 695 cases of RA. Sex-specific and overall prevalence rates (per 1,000) were 1.97 (95% CI 1.8-2) for all, 0.6 (95% CI 0.49-0.73) for men, 3.2 (95% CI 2.9-3.5) for women. CONCLUSION: Prevalence of RA is low in residents of Tucumán, Argentina, and comparable with rates observed in epidemiological surveys from Southern European countries. 相似文献
82.
M Ledesma Velasco R Verdín Vázquez J L Acosta Valdez J Munayer Calderón J L Salgado Escobar L Arias Monroy J Flores Mendoza 《Archivos del Instituto de Cardiología de México》1989,59(1):69-71
We performed catheter balloon valvuloplasty (CBV) on 8 stenotic operatively-excised bioprosthetic valves (2 Hancock and 6 Ionescu Shiley). Pathology of valves before CBV included degenerative changes: commissural fusion by mounds of calcific deposits (2 valves), fibrotic and focally calcified leaflets (7 valves) and stiff and thick valves (1 valve). Inflation of the balloon resulted in commissural splitting (2 valves), leaflet cracks and fractures (3 valves). Removal of the deflated balloon catheter was associated with debris dislodgement (3 valves). In one case the valve was unable to close with potential for acute regurgitation. Thus, CBV of bioprosthetic valves can split fused commissures by similar mechanisms as in native valves. CBV may fracture calcific deposits causing acute emboli. It can also disrupt the leaflets causing acute insufficiency. The findings suggest a limited role of CBV in the treatment of stenotic bioprosthetic valves in mitral and aortic position. 相似文献
83.
84.
Correlation between lumbar skeletal muscle size and urinary incontinence after radical prostatectomy
85.
86.
87.
88.
89.
90.
The epidemiological status of HCV in Europe, and in particular in Mediterranean countries, is continuously evolving. The genotype distribution is related to improvement of healthcare conditions, expansion of intravenous drug use and immigration. We review and characterize the epidemiology of the distribution of HCV genotypes within Calabria, an area of Southern Italy. We focus on the pattern of distinct HCV genotype changes over the last 16 years; particularly subtype 1b and genotype 4. We collected data by evaluating a hospital-based cohort of chronic hepatitis C patients; in addition, we report an update including new patients enrolled during last eight months. 相似文献