全文获取类型
收费全文 | 40886篇 |
免费 | 3086篇 |
国内免费 | 82篇 |
专业分类
耳鼻咽喉 | 255篇 |
儿科学 | 1723篇 |
妇产科学 | 1378篇 |
基础医学 | 4938篇 |
口腔科学 | 536篇 |
临床医学 | 6026篇 |
内科学 | 7440篇 |
皮肤病学 | 704篇 |
神经病学 | 4119篇 |
特种医学 | 625篇 |
外科学 | 3558篇 |
综合类 | 462篇 |
一般理论 | 38篇 |
预防医学 | 5970篇 |
眼科学 | 564篇 |
药学 | 2516篇 |
1篇 | |
中国医学 | 63篇 |
肿瘤学 | 3138篇 |
出版年
2024年 | 44篇 |
2023年 | 370篇 |
2022年 | 561篇 |
2021年 | 1053篇 |
2020年 | 748篇 |
2019年 | 1173篇 |
2018年 | 1383篇 |
2017年 | 1052篇 |
2016年 | 1056篇 |
2015年 | 1170篇 |
2014年 | 1574篇 |
2013年 | 2310篇 |
2012年 | 3341篇 |
2011年 | 3439篇 |
2010年 | 1855篇 |
2009年 | 1690篇 |
2008年 | 2662篇 |
2007年 | 2854篇 |
2006年 | 2612篇 |
2005年 | 2594篇 |
2004年 | 2410篇 |
2003年 | 2146篇 |
2002年 | 2032篇 |
2001年 | 290篇 |
2000年 | 210篇 |
1999年 | 254篇 |
1998年 | 360篇 |
1997年 | 281篇 |
1996年 | 242篇 |
1995年 | 227篇 |
1994年 | 207篇 |
1993年 | 174篇 |
1992年 | 120篇 |
1991年 | 103篇 |
1990年 | 117篇 |
1989年 | 104篇 |
1988年 | 77篇 |
1987年 | 80篇 |
1986年 | 76篇 |
1985年 | 91篇 |
1984年 | 103篇 |
1983年 | 73篇 |
1982年 | 98篇 |
1981年 | 82篇 |
1980年 | 74篇 |
1979年 | 51篇 |
1978年 | 57篇 |
1977年 | 41篇 |
1975年 | 35篇 |
1972年 | 31篇 |
排序方式: 共有10000条查询结果,搜索用时 78 毫秒
1.
2.
3.
4.
5.
A cross-sectional survey of patients' beliefs about stress and their help-seeking behaviour 下载免费PDF全文
BACKGROUND: Stress has become an increasingly common presentation in general practice. This may relate to an increase in stress in people's lives or a change in the meaning of stress and its conceptualisation as a legitimate problem for the GP. AIM: To explore patients' beliefs about stress, their association with help-seeking behaviour, and to examine differences by ethnic group. DESIGN OF STUDY: Cross-sectional survey of general practice patients attending to see their GP. SETTING: An inner-city London practice. METHOD: Consecutive general practice patients completed a questionnaire, which involved rating a series of symptoms for the extent to which they were associated with stress and describing their help-seeking behaviour. In total, 548 patients completed the questionnaire. Most patients described themselves as black Caribbean (n = 163), black African (n = 48), or white British (n = 187). RESULTS: The symptoms most frequently associated with stress were sleeping problems, feeling depressed, feeling panicky, having high blood pressure and feeling anxious; feeling ashamed, experiencing indigestion, having diarrhoea, feeling hot or cold, and suffering from constipation were least commonly associated to stress. This model of stress did not vary by ethnic group. Ethnic group differences were found for the association between the model of stress and help-seeking behaviour. Although white British patients consistently reported that the more a symptom was seen as indicative of stress, the more likely they would be to visit the doctor for that symptom, this association was not found for either black Caribbean or black African patients. CONCLUSIONS: The belief that stress-related symptoms are a legitimate problem for the GP is not universal and varies according to ethnic group. Stress is used by different patients in different ways and offers a variable pathway to the doctor. 相似文献
6.
7.
8.
Marilyn Hravnak Leslie A Hoffman Melissa I Saul Thomas G Zullo Julie F Cuneo Ronald V Pellegrini 《American journal of critical care》2004,13(6):499-507; discussion 508
BACKGROUND: Studies suggest that patients who undergo off-pump coronary artery bypass grafting (OPCABG) have fewer short-term complications and use fewer inpatient resources than do patients who undergo standard coronary artery bypass grafting (CABG) with extracorporeal circulation. However, dissimilarity between groups in risk factors for complications has hindered interpretation of results. OBJECTIVES: To compare the prevalence of selected complications (atrial fibrillation, stroke, reoperation, and bleeding) and inpatient resource utilization (length of stay, discharge disposition, total charges) between subjects undergoing primary isolated CABG or OPCABG who were matched with respect to key risk factors. METHODS: Retrospective, causal-comparative survey conducted in 1 center for 18 months. Patients who underwent primary isolated CABG or OPCABG were matched for sex, age (within 2 years), left ventricular ejection fraction (within 0.05), and graft-patient ratio (exact match) and compared for prevalence of new-onset atrial fibrillation, stroke, reoperation within 24 hours, and bleeding. Statistical analysis included Wilcoxon and t tests for paired comparisons. RESULTS: The sample (107 matched pairs) was 63% male, with a mean age of 66 (SD 9.5) years, a mean left ventricular ejection fraction of 0.51 (SD 0.13), and a mean graft-patient ratio of 3.41 (SD 0.74). The 2 groups did not differ significantly in New York Heart Association class (P = .43), Acute Physiology and Chronic Health Evaluation III score (P = .22), postoperative beta-blocker use (P = .73), or comorbid conditions. None of the complications examined differed significantly between pairs. CONCLUSION: Patients with comparable risk profiles have similar prevalences of selected complications after CABG and OPCABG. 相似文献
9.
10.