全文获取类型
收费全文 | 646篇 |
免费 | 22篇 |
国内免费 | 4篇 |
专业分类
耳鼻咽喉 | 7篇 |
儿科学 | 8篇 |
妇产科学 | 23篇 |
基础医学 | 80篇 |
口腔科学 | 4篇 |
临床医学 | 59篇 |
内科学 | 83篇 |
皮肤病学 | 24篇 |
神经病学 | 70篇 |
特种医学 | 18篇 |
外科学 | 57篇 |
综合类 | 2篇 |
预防医学 | 66篇 |
眼科学 | 13篇 |
药学 | 95篇 |
肿瘤学 | 63篇 |
出版年
2023年 | 3篇 |
2022年 | 4篇 |
2021年 | 7篇 |
2020年 | 7篇 |
2019年 | 11篇 |
2018年 | 11篇 |
2017年 | 11篇 |
2016年 | 11篇 |
2015年 | 7篇 |
2014年 | 15篇 |
2013年 | 45篇 |
2012年 | 31篇 |
2011年 | 33篇 |
2010年 | 27篇 |
2009年 | 17篇 |
2008年 | 40篇 |
2007年 | 38篇 |
2006年 | 53篇 |
2005年 | 26篇 |
2004年 | 50篇 |
2003年 | 36篇 |
2002年 | 44篇 |
2001年 | 9篇 |
2000年 | 7篇 |
1999年 | 11篇 |
1998年 | 12篇 |
1997年 | 5篇 |
1996年 | 7篇 |
1995年 | 8篇 |
1994年 | 8篇 |
1993年 | 8篇 |
1992年 | 6篇 |
1991年 | 4篇 |
1990年 | 6篇 |
1989年 | 7篇 |
1988年 | 5篇 |
1987年 | 2篇 |
1986年 | 6篇 |
1985年 | 6篇 |
1984年 | 3篇 |
1983年 | 3篇 |
1982年 | 3篇 |
1980年 | 4篇 |
1979年 | 2篇 |
1978年 | 4篇 |
1977年 | 3篇 |
1974年 | 2篇 |
1967年 | 3篇 |
1964年 | 1篇 |
排序方式: 共有672条查询结果,搜索用时 15 毫秒
671.
Löfgren E Mikkonen K Tolonen U Pakarinen A Koivunen R Myllyla VV Tapanainen JS Isojärvi JI 《Epilepsy & behavior : E&B》2007,10(1):77-83
The purpose of the analysis described here was to assess reproductive endocrine disorders in 148 women with epilepsy (WWE) by epilepsy type and antiepileptic drug use. Women with idiopathic generalized epilepsy had a higher prevalence of reproductive endocrine disorders than control subjects. In addition, hyperandrogenism, polycystic ovaries, and polycystic ovary syndrome were more prevalent in WWE on valproate than in WWE taking other drugs or control women. The use of VPA was a predictor of the development of polycystic ovaries and polycystic ovary syndrome, and the use of valproate and younger age predicted the development of hyperandrogenism. In conclusion, both idiopathic generalized epilepsy and valproate were associated with an increased risk of reproductive endocrine disorders in WWE in this post hoc reanalysis of data on a large number of WWE. This was especially evident if the epilepsy was active and required treatment early in life. 相似文献
672.
Incidence and risk factors for mild cognitive impairment: a population-based three-year follow-up study of cognitively healthy elderly subjects 总被引:8,自引:0,他引:8
Tervo S Kivipelto M Hänninen T Vanhanen M Hallikainen M Mannermaa A Soininen H 《Dementia and geriatric cognitive disorders》2004,17(3):196-203
BACKGROUND: Mild cognitive impairment (MCI) has attracted considerable interest as a potential predictor of Alzheimer's disease (AD). Both the apolipoprotein E (ApoE) epsilon4 allele and vascular factors have been associated with a higher risk for AD, recently they have also been linked to the risk of MCI. OBJECTIVES: To estimate the incidence of MCI among cognitively healthy elderly subjects during a 3-year follow-up, and to evaluate the impact of demographic and vascular factors as well as the ApoE epsilon4 allele on the conversion to MCI. METHODS: At baseline, the cognitive abilities of 806 out of 1,150 eligible subjects (aged 60-76 years) from a population-based sample were examined. Cognitively intact subjects (n = 747) were followed for an average of 3 years. RESULTS: 66 subjects (8.8%) had converted to MCI. The global incidence rate of MCI was 25.94/1,000 person-years. Persons with higher age (OR 1.08, 95% CI 1.01-1.16), ApoE epsilon4 allele carriers (OR 2.04, 95% CI 1.15-3.64) and persons with medicated hypertension (OR 1.86, 95% CI 1.05-3.29) were more likely to convert to MCI than those individuals of lower age and without an ApoE epsilon4 allele or medicated hypertension. Persons with high education (OR 0.79, 95% CI 0.70-0.89) were less likely to convert to MCI than persons with low or no education. In subjects with both the ApoE epsilon4 allele and medicated hypertension, the crude OR for conversion was 3.92 (95% CI 1.81-8.49). In subjects with cardiovascular disease, the crude OR for conversion was 2.13 (95% CI 1.26-3.60). Gender, elevated blood pressure, diabetes or cerebrovascular disease had no significant effect on the conversion to MCI. CONCLUSION: Higher age, the presence of at least one ApoE epsilon4 allele and medicated hypertension are independent risk factors, but high education is a protective factor for MCI. The results suggest that vascular factors may have an important role in the pathogenesis of MCI. 相似文献