全文获取类型
收费全文 | 463篇 |
免费 | 34篇 |
国内免费 | 5篇 |
专业分类
耳鼻咽喉 | 5篇 |
儿科学 | 49篇 |
妇产科学 | 3篇 |
基础医学 | 29篇 |
口腔科学 | 15篇 |
临床医学 | 62篇 |
内科学 | 90篇 |
皮肤病学 | 1篇 |
神经病学 | 6篇 |
特种医学 | 140篇 |
外科学 | 22篇 |
综合类 | 30篇 |
预防医学 | 19篇 |
眼科学 | 2篇 |
药学 | 17篇 |
肿瘤学 | 12篇 |
出版年
2022年 | 1篇 |
2021年 | 3篇 |
2020年 | 1篇 |
2019年 | 2篇 |
2018年 | 9篇 |
2017年 | 6篇 |
2016年 | 6篇 |
2015年 | 10篇 |
2014年 | 18篇 |
2013年 | 19篇 |
2012年 | 8篇 |
2011年 | 3篇 |
2010年 | 10篇 |
2009年 | 7篇 |
2008年 | 9篇 |
2007年 | 9篇 |
2006年 | 8篇 |
2005年 | 5篇 |
2004年 | 9篇 |
2003年 | 7篇 |
2002年 | 7篇 |
2001年 | 8篇 |
2000年 | 5篇 |
1999年 | 15篇 |
1998年 | 30篇 |
1997年 | 33篇 |
1996年 | 34篇 |
1995年 | 30篇 |
1994年 | 30篇 |
1993年 | 19篇 |
1992年 | 4篇 |
1991年 | 5篇 |
1990年 | 5篇 |
1989年 | 13篇 |
1988年 | 17篇 |
1987年 | 15篇 |
1986年 | 16篇 |
1985年 | 15篇 |
1984年 | 8篇 |
1983年 | 11篇 |
1982年 | 4篇 |
1981年 | 9篇 |
1980年 | 5篇 |
1979年 | 2篇 |
1978年 | 2篇 |
1977年 | 3篇 |
1976年 | 5篇 |
1975年 | 2篇 |
排序方式: 共有502条查询结果,搜索用时 15 毫秒
71.
ABSTRACT Isolated congenital tricuspid valve dysplasia is a rare and potentially lethal congenital heart disease that can be easily confused with persistent pulmonary hypertension of the newborn. We describe a neonate with isolated congenital tricuspid valve dysplasia who did not respond to mechanical ventilation but improved by tolazoline. Clinicians should be aware that the initial fulminant course of this condition may be reversed by reducing the pulmonary vascular resistance, thereby allowing time for spontaneous recovery. 相似文献
72.
A case of mixed connective tissue disease (MCTD) is presented in which mediastinal lymphadenopathy was the most prominent radiological finding detected by plain chest radiographs and computed tomography. Pulmonary arterial hypertension, which is a rare and often fatal complication of MCTD, also developed in this patient. 相似文献
73.
74.
Endoscopic retrograde biliary drainage 总被引:1,自引:0,他引:1
75.
Large-cell lymphoma of the spleen: CT appearance 总被引:2,自引:0,他引:2
76.
Occlusion of varicoceles wih detachable balloons 总被引:1,自引:0,他引:1
77.
78.
Bosco HM Ma Calvin SH Ng Rebecca KY Lam Song Wan Innes YP Wan Tak Wai Lee Anthony PC Yim 《Canadian respiratory journal》2009,16(4):e50-e52
Pulmonary infection caused by the opportunistic organisms Penicillium marneffei and Stenotrophomonas maltophilia in patients with Job’s syndrome is rare and not well documented. The case of a 30-year-old man with Job’s syndrome who developed recurrent pneumonia and lung abscesses caused by P marneffei and S maltophilia, complicated by massive hemoptysis, is described. Bronchial artery embolization was successful in controlling the hemoptysis; however, the infection proved fatal despite appropriate antimicrobial therapy. A brief review of the literature on Job’s syndrome and its associated infective pulmonary manifestations is also presented. 相似文献
79.
80.
OBJECTIVES: To investigate the relationship of specific nutrients and food items with oral precancerous lesions among tobacco users.
DESIGN: A population-based case-control study. SETTING: Villages in Palitana taluk of Bhavnagar district, Gujarat, India.
SUBJECTS AND METHODS: An interviewer-administered food frequency questionnaire, developed and validated for this population, was used to estimate nutrient intake in blinded, house-to-house interviews. Among 5018 male tobacco users, 318 were diagnosed as cases. An equal number of controls matched on age (±5 years), sex, village, and use of tobacco were selected.
MAIN OUTCOME MEASURES: Odds ratios (OR) from multiple logistic regression analysis controlling for relevant variables (type of tobacco use and economic status).
RESULTS: A protective effect of fibre was observed for both oral submucous fibrosis (OSF) and leukoplakia, with 10% reduction in risk per g day-1 ( P < 0.05). Ascorbic acid appeared to be protective against leukoplakia with the halving of risk in the two highest quartiles of intake (versus the lowest quartile: OR = 0.46 and 0.44, respectively; P < 0.10). A protective effect of tomato consumption was observed in leukoplakia and a suggestion of a protective effect of wheat in OSF.
CONCLUSION: In addition to tobacco use, intake of specific nutrients may have a role in the development of oral precancerous lesions. 相似文献
DESIGN: A population-based case-control study. SETTING: Villages in Palitana taluk of Bhavnagar district, Gujarat, India.
SUBJECTS AND METHODS: An interviewer-administered food frequency questionnaire, developed and validated for this population, was used to estimate nutrient intake in blinded, house-to-house interviews. Among 5018 male tobacco users, 318 were diagnosed as cases. An equal number of controls matched on age (±5 years), sex, village, and use of tobacco were selected.
MAIN OUTCOME MEASURES: Odds ratios (OR) from multiple logistic regression analysis controlling for relevant variables (type of tobacco use and economic status).
RESULTS: A protective effect of fibre was observed for both oral submucous fibrosis (OSF) and leukoplakia, with 10% reduction in risk per g day
CONCLUSION: In addition to tobacco use, intake of specific nutrients may have a role in the development of oral precancerous lesions. 相似文献