全文获取类型
收费全文 | 75680篇 |
免费 | 4972篇 |
国内免费 | 2013篇 |
专业分类
耳鼻咽喉 | 799篇 |
儿科学 | 1475篇 |
妇产科学 | 1062篇 |
基础医学 | 6669篇 |
口腔科学 | 1053篇 |
临床医学 | 7075篇 |
内科学 | 10090篇 |
皮肤病学 | 2427篇 |
神经病学 | 3883篇 |
特种医学 | 2081篇 |
外国民族医学 | 3篇 |
外科学 | 3314篇 |
综合类 | 9803篇 |
现状与发展 | 6篇 |
预防医学 | 8701篇 |
眼科学 | 739篇 |
药学 | 16683篇 |
40篇 | |
中国医学 | 2759篇 |
肿瘤学 | 4003篇 |
出版年
2024年 | 122篇 |
2023年 | 879篇 |
2022年 | 1987篇 |
2021年 | 2587篇 |
2020年 | 2281篇 |
2019年 | 2097篇 |
2018年 | 2160篇 |
2017年 | 2152篇 |
2016年 | 2254篇 |
2015年 | 2519篇 |
2014年 | 5014篇 |
2013年 | 5797篇 |
2012年 | 4918篇 |
2011年 | 5415篇 |
2010年 | 4168篇 |
2009年 | 3953篇 |
2008年 | 3945篇 |
2007年 | 3917篇 |
2006年 | 3321篇 |
2005年 | 2912篇 |
2004年 | 2378篇 |
2003年 | 2062篇 |
2002年 | 1651篇 |
2001年 | 1503篇 |
2000年 | 1274篇 |
1999年 | 1241篇 |
1998年 | 926篇 |
1997年 | 925篇 |
1996年 | 797篇 |
1995年 | 774篇 |
1994年 | 701篇 |
1993年 | 551篇 |
1992年 | 579篇 |
1991年 | 496篇 |
1990年 | 423篇 |
1989年 | 418篇 |
1988年 | 414篇 |
1987年 | 380篇 |
1986年 | 331篇 |
1985年 | 373篇 |
1984年 | 326篇 |
1983年 | 230篇 |
1982年 | 255篇 |
1981年 | 192篇 |
1980年 | 190篇 |
1979年 | 139篇 |
1978年 | 136篇 |
1977年 | 119篇 |
1976年 | 106篇 |
1975年 | 103篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
2.
Defining con-founders that affect the reliability of diagnostic tests for coronavirus disease 2019 is vital to breaking the chain of infection. The elderly population is a higher risk group for the emerging virus. However, gender seems to exert a critical role in modifying the infection risk among women owing to hormonal changes. The menopause transition is an exceptional period for older women where the protective and immunomodulatory effects of the estrogen hormone are lost. Accordingly, attention should be given to postmenopausal women since they will have an increased risk compared to their pre-menopausal peers. 相似文献
3.
《Gait & posture》2022
BackgroundOne in two people with multiple sclerosis (PwMS) will fall in a three-month period. Predicting which patients will fall remains a challenge for clinicians. Standardized functional assessments provide insight into balance deficits and fall risk but their use has been limited to supervised visits.Research questionThe study aim was to characterize unsupervised 30-second chair stand test (30CST) performance using accelerometer-derived metrics and assess its ability to classify fall status in PwMS compared to supervised 30CST.MethodsThirty-seven PwMS (21 fallers) performed instrumented supervised and unsupervised 30CSTs with a single wearable sensor on the thigh. In unsupervised conditions, participants performed bi-hourly 30CSTs and rated their balance confidence and fatigue over 48-hours. ROC analysis was used to classify fall status for 30CST performance.ResultsNon-fallers (p = 0.02) but not fallers (p = 0.23) differed in their average unsupervised 30CST performance (repetitions) compared to their supervised performance. The unsupervised maximum number of 30CST repetitions performed optimized ROC classification AUC (0.79), accuracy (78.4%) and specificity (90.0%) for fall status with an optimal cutoff of 17 repetitions.SignificanceBrief durations of instrumented unsupervised monitoring as an adjunct to routine clinical assessments could improve the ability for predicting fall risk and fluctuations in functional mobility in PwMS. 相似文献
4.
《Research in social & administrative pharmacy》2022,18(9):3694-3698
In this paper, we argue that understanding and addressing the problem of poor-quality medical products requires a more interdisciplinary approach than has been evident to date. While prospective studies based on rigorous standardized methodologies are the gold standard for measuring the prevalence of poor-quality medical products and understanding their distribution nationally and internationally, they should be complemented by social science research to unpack the complex set of social, economic, and governance factors that underlie these patterns. In the following sections, we discuss specific examples of prospective quality surveys and of social science studies, highlighting the value of cross-sector partnerships in driving high-quality, policy-relevant research in this area. 相似文献
5.
6.
Esin Benli Küçük Ercan Kaydok Kürsad Ramazan Zor Gamze Yıldırım Biçer 《Topics in stroke rehabilitation》2020,27(8):630-635
ABSTRACT Objective: Dry eye is reported to be associated with several neurological diseases. The aim of this study is to evaluate the patients with hemiplegia after stroke for dry eye and compare their results with a control group. Materials and methods: Forty-five patients with hemiplegia and 45 individuals as the control group were included in the study. Tear function tests (Schirmer and tear breakup time) and a dry eye questionnaire for dry eye symptoms (ocular surface disease index) were performed and the results of the two groups were compared. Results: Schirmer test results were significantly lower in the post-stroke hemiplegia group compared to the control group (11.3 ± 8.2 mm and 20.6 ± 11.6 mm, respectively, p < .001). Tear breakup time results were significantly lower in the post-stroke hemiplegia group compared to the control group (7.9 ± 3.1 s and 12.1 ± 4.3 s, respectively, p < .001). Ocular surface disease index scores were not significantly different between hemiplegia and control groups (21.6 ± 20.0 and 19.8 ± 13.9, respectively, p = .635). Schirmer scores lower than 10 mm (60% and 30%, p < .001) and tear breakup time results lower than 10 s (65.6% and 28.9%, p < .001) were also higher in the hemiplegia group compared to control group. Conclusion: We found lower Schirmer test and tear breakup time results and similar OSDI scores in hemiplegia patients compared to controls. Hemiplegia patients may have dry eye without typical symptoms. This should be taken into consideration in the follow-up and rehabilitation of post-stroke hemiplegia patients. 相似文献
7.
8.
9.
10.