全文获取类型
收费全文 | 129392篇 |
免费 | 41205篇 |
国内免费 | 412篇 |
专业分类
耳鼻咽喉 | 1855篇 |
儿科学 | 5394篇 |
妇产科学 | 700篇 |
基础医学 | 27557篇 |
口腔科学 | 6978篇 |
临床医学 | 15724篇 |
内科学 | 28832篇 |
皮肤病学 | 4607篇 |
神经病学 | 18564篇 |
特种医学 | 6221篇 |
外国民族医学 | 9篇 |
外科学 | 15409篇 |
综合类 | 2594篇 |
现状与发展 | 1篇 |
一般理论 | 8篇 |
预防医学 | 9523篇 |
眼科学 | 1436篇 |
药学 | 10131篇 |
中国医学 | 1994篇 |
肿瘤学 | 13472篇 |
出版年
2024年 | 11篇 |
2023年 | 95篇 |
2022年 | 305篇 |
2021年 | 1842篇 |
2020年 | 6287篇 |
2019年 | 11635篇 |
2018年 | 11263篇 |
2017年 | 12462篇 |
2016年 | 11618篇 |
2015年 | 11556篇 |
2014年 | 11733篇 |
2013年 | 11857篇 |
2012年 | 11073篇 |
2011年 | 11234篇 |
2010年 | 9669篇 |
2009年 | 6245篇 |
2008年 | 6804篇 |
2007年 | 5267篇 |
2006年 | 4998篇 |
2005年 | 4779篇 |
2004年 | 4552篇 |
2003年 | 4168篇 |
2002年 | 3886篇 |
2001年 | 3074篇 |
2000年 | 1874篇 |
1999年 | 653篇 |
1998年 | 409篇 |
1997年 | 383篇 |
1996年 | 313篇 |
1995年 | 307篇 |
1994年 | 268篇 |
1993年 | 161篇 |
1992年 | 106篇 |
1991年 | 85篇 |
1990年 | 28篇 |
1989年 | 9篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
31.
32.
33.
34.
35.
Adam Wagstaff 《Health economics》2019,28(6):765-781
In the “basic” approach, medical expenses are catastrophic if they exceed a prespecified percentage of consumption or income; the approach tells us if expenses cause a large percentage reduction in living standards. The ability‐to‐pay (ATP) approach defines expenses as catastrophic if they exceed a prespecified percentage of consumption less expenses on nonmedical necessities or an allowance for them. The paper argues that the ATP approach does not tell us whether expenses are large enough to undermine a household's ability to purchase nonmedical necessities. The paper compares the income‐based and consumption‐based variants of the basic approach, and shows that if the individual is a borrower after a health shock, the income‐based ratio will exceed the consumption‐based ratio, and both will exceed the more theoretically correct Flores et al. ratio; whereas if the individual continues to be a saver after a health shock, the ordering is reversed and the income‐based ratio may not overestimate Flores et al.'s ratio. Last, the paper proposes a lifetime money metric utility (LMMU) approach defining medical expenses as catastrophic in terms of their lifetime consequences. Under certain assumptions, the LMMU and Flores et al. approaches are identical, and neither requires data on how households finance their medical expenses. 相似文献
36.
Yuan Peng Yuman Li Haiyan Cao Liu Hong Yu Wang Mingxing Xie 《Journal of ultrasound in medicine》2019,38(2):539-544
A pulmonary artery (PA) sling is a very rare congenital cardiovascular anomaly, and only a few studies have reported PA slings in fetuses. The relationship of the PA, aorta, ductus arteriosus, and trachea can be evaluated in the 3‐vessel and 3‐vessel and trachea views during fetal echocardiography. A PA sling can be detected by abnormal positioning of the left PA in relation to the trachea when sweeping from the 3‐vessel view cranially to the 3‐vessel and trachea view. Here we report 3 cases of fetal PA slings and their follow‐ups. Two cases were confirmed by postnatal echocardiography, and the other case was confirmed by a cardiovascular cast after pregnancy termination. We emphasize that the 3‐vessel and 3‐vessel and trachea views are of crucial importance in the prenatal diagnosis of a PA sling. 相似文献
37.
38.
39.
To increase the overall rate of breastfeeding initiation and duration, factors involved in a mother's decision to breastfeed must be identified. Self‐objectification in the context of breastfeeding was a concept selected for exploring factors associated with negative views of breastfeeding. A concept analysis following the eight‐step Walker & Avant method provides clarity and context to the concept of self‐objectification in the context of breastfeeding. The antecedents of self‐objectification in the context of breastfeeding include living in a culture of sexualization and objectification of women and the internalization of the values of objectification. Attributes of self‐objectification in the context of breastfeeding are a prioritization of physical appearance attributes of the breast over the health benefits of breastfeeding and a preoccupation with physical appearance. Consequences include negative views toward breastfeeding initiation, duration, and public breastfeeding. A concept analysis on self‐objectification in the context of breastfeeding will provide definition and clarity to this phenomenon, lend to theory and measurement, and add literature to the sociocultural factors impacting breastfeeding decisions. 相似文献
40.