全文获取类型
收费全文 | 6843篇 |
免费 | 739篇 |
国内免费 | 13篇 |
专业分类
耳鼻咽喉 | 58篇 |
儿科学 | 266篇 |
妇产科学 | 438篇 |
基础医学 | 856篇 |
口腔科学 | 131篇 |
临床医学 | 1390篇 |
内科学 | 1175篇 |
皮肤病学 | 151篇 |
神经病学 | 768篇 |
特种医学 | 554篇 |
外国民族医学 | 1篇 |
外科学 | 778篇 |
综合类 | 143篇 |
预防医学 | 382篇 |
眼科学 | 40篇 |
药学 | 211篇 |
中国医学 | 5篇 |
肿瘤学 | 248篇 |
出版年
2023年 | 52篇 |
2021年 | 75篇 |
2020年 | 70篇 |
2019年 | 62篇 |
2018年 | 124篇 |
2017年 | 137篇 |
2016年 | 135篇 |
2015年 | 187篇 |
2014年 | 221篇 |
2013年 | 248篇 |
2012年 | 259篇 |
2011年 | 279篇 |
2010年 | 216篇 |
2009年 | 194篇 |
2008年 | 273篇 |
2007年 | 277篇 |
2006年 | 234篇 |
2005年 | 231篇 |
2004年 | 219篇 |
2003年 | 251篇 |
2002年 | 218篇 |
2001年 | 205篇 |
2000年 | 194篇 |
1999年 | 183篇 |
1998年 | 194篇 |
1997年 | 181篇 |
1996年 | 163篇 |
1995年 | 132篇 |
1994年 | 104篇 |
1993年 | 84篇 |
1992年 | 123篇 |
1991年 | 125篇 |
1990年 | 104篇 |
1989年 | 107篇 |
1988年 | 141篇 |
1987年 | 122篇 |
1986年 | 121篇 |
1985年 | 105篇 |
1984年 | 89篇 |
1983年 | 82篇 |
1982年 | 62篇 |
1981年 | 55篇 |
1980年 | 55篇 |
1979年 | 63篇 |
1978年 | 80篇 |
1977年 | 67篇 |
1976年 | 61篇 |
1975年 | 44篇 |
1973年 | 48篇 |
1972年 | 50篇 |
排序方式: 共有7595条查询结果,搜索用时 31 毫秒
1.
Sharisse M. Arnold Rehring Liza M. Reifler Jennifer H. Seidel Karen A. Glenn John F. Steiner 《Academic pediatrics》2019,19(5):572-580
ObjectiveClinical specialty societies recommend long-acting reversible contraceptives (LARCs) as first-line contraception for adolescent women. We evaluated whether a combined educational and process improvement intervention enhanced LARC placement in primary care within an integrated health care system.MethodsThe intervention included journal clubs, live continuing education, point-of-care guidelines, and new patient materials. We conducted a retrospective cohort study across 3 time periods: baseline (January 2013?September 2015), early implementation (October 2015–March 2016), and full implementation (April 2016–June 2017). The primary outcome was the proportion of LARCs placed by primary care clinicians among women aged 13 to 18 years compared with gynecology clinicians.ResultsKaiser Foundation Health Plan of Colorado cared for approximately 20,000 women aged 13 to 18 years in each calendar quarter between 2013 and 2017. Overall, LARC placement increased from 7.0 per 1000 members per quarter at baseline to 13.0 per 1000 during the full intervention. Primary care clinicians placed 6.2% of all LARCs in 2013, increasing to 32.1% by 2017 (P < .001), including 45.5% of contraceptive implants. Clinicians who attended educational sessions were more likely to adopt LARCs than those who did not (17.9% vs 6.4% respectively, P = .009). Neither overall LARC placement rates (relative risk, 1.9; 95% confidence interval, 0.7?5.6) nor contraceptive implant rates (relative risk, 3.0; 95% confidence interval, 0.9?9.8) increased significantly in clinicians who attended educational activities.ConclusionsThis multimodal intervention was associated with increased LARC placement for adolescent women in primary care. The combination of education and process improvement is a promising strategy to promote clinician behavior change. 相似文献
2.
3.
Manuel Steiner Andishe Attarbaschi Margit K nig Helmut Gadner Oskar A. Haas Georg Mann 《Pediatric hematology and oncology》2004,22(1):11-16
Constitutional trisomy 21 is the most prominent predisposing factor to childhood leukemia, whereas the t(12;21)(p13;q22) with its molecular genetic counterpart, the TEL/AML1 fusion gene, is the most common acquired chromosomal rearrangement in childhood B-cell precursor (BCP) acute lymphoblastic leukemia (ALL). Thus, it was somewhat surprising that according to the currently available literature the incidence of TEL/AML1+ BCP ALL is extremely low in patients with Down syndrome (DS). To further investigate this issue in a population-based fashion, the authors retrospectively assessed the number of DS patients with a TEL/AML1+ ALL in two consecutive Austrian ALL multicenter trials. Accordingly, they were able to analyze 8 of 10 individuals with DS and a BCP ALL, including 2 who suffered from a TEL/AML1+ leukemia. Based on this observation we concluded that individuals with a constitutional trisomy 21 may have the similar likelihood to develop a TEL/AML1+ leukemia as BCP ALL patients without this specific predisposing factor. 相似文献
4.
D Van Neste† RM Trüeb‡ 《Journal of the European Academy of Dermatology and Venereology》2006,20(5):578-583
BACKGROUND: Computer-assisted image analysis has been proposed for human hair growth studies. METHODS: The performances of Trichoscan, a commercially available automated system combining epiluminiscence microscopy with digital image analysis, developed for office-based hair growth measurements, have been evaluated comparatively on the same skin sites using standardized photographic equipment and calibrated processing for contrast-enhanced phototrichogram (CE-PTG) analysis. This reference method has been validated with scalp biopsies and histological examination of serial sectioning. RESULTS: Besides edge effects, hair fibres escaped the Trichoscan analysis for various reasons including, but not limited to, thickness, pigmentation, closeness and crossing. CONCLUSION: Most of these problems have been identified in the late 1980s and remain largely unsolved by the processing software that was evaluated in 2004. Therefore claims promoting the Trichoscan method for accurate hair measurements in clinical trials on scalp and body hair are not supported by the present investigation. The speed at which the analysis is performed is outweighed by the errors in signal detection. Therefore we suggest that improvements must be clearly documented before Trichoscan is established for quantified diagnostic purposes and detailed hair cycle monitoring during hair trials. 相似文献
5.
Zusammenfassung Dieser Artikel stellt eine Übersetzung der im Jahr 2006 herausgegebenen Empfehlungen zur Behandlung von Patienten mit spontaner intrazerebraler Blutung der Europäischen Schlaganfallinitiative (EUSI) für das Europäische Schlaganfall-Council (ESC), die Europäische Neurologische Gesellschaft (ENS) und die Europäische Förderation Neurologischer Gesellschaften (EFNS) dar.Diese EUSI-Empfehlungen werden von dem European Stroke Council (ESC), der European Neurological Society (ENS) und der European Federation of Neurological Societies (EFNS) unterstützt. 相似文献
6.
7.
Meir Steiner Richard J. Katz Giulio Baldrighi Bernard J. Carroll 《Psychoneuroendocrinology》1981,6(1):81-90
(1) The estrous cycle in the rat may be used to study recurrent changes in motor behaviors and motivation which are strongly related to cyclic hormonal and CNS changes. (2) The peak in motivated behaviors occurs during a sharply defined period on the night between proestrus and estrus and is evident in facilitated wheel-running, lordosis, and intracranial self-stimulation. (3) Behaviors without a clearly motivated character do not show an estrous cyclicity. (4) The estrous cyclic variation in intracranial self-stimulation was observed at a specific locus — the pars campacta of the substantia nigra. (5) A neurochemical link between sexually motivated behavior, wheel running and intracranial self-stimulation is suggested. This link is in part dopaminergic but is probably also activated by many other systems. 相似文献
8.
Andreas Steiner 《Wiener Medizinische Wochenschrift》2005,155(1-2):14-16
9.
10.