全文获取类型
收费全文 | 1792613篇 |
免费 | 133906篇 |
国内免费 | 3942篇 |
学科分类
医药卫生 | 1930461篇 |
出版年
2021年 | 14369篇 |
2019年 | 15175篇 |
2018年 | 21978篇 |
2017年 | 16962篇 |
2016年 | 18564篇 |
2015年 | 21097篇 |
2014年 | 29185篇 |
2013年 | 41921篇 |
2012年 | 58840篇 |
2011年 | 61595篇 |
2010年 | 36052篇 |
2009年 | 34078篇 |
2008年 | 57024篇 |
2007年 | 60529篇 |
2006年 | 60789篇 |
2005年 | 57793篇 |
2004年 | 55250篇 |
2003年 | 52390篇 |
2002年 | 50245篇 |
2001年 | 95176篇 |
2000年 | 96955篇 |
1999年 | 80020篇 |
1998年 | 21050篇 |
1997年 | 18388篇 |
1996年 | 18550篇 |
1995年 | 17694篇 |
1994年 | 16164篇 |
1993年 | 14877篇 |
1992年 | 59556篇 |
1991年 | 57262篇 |
1990年 | 54827篇 |
1989年 | 52522篇 |
1988年 | 47774篇 |
1987年 | 46388篇 |
1986年 | 43592篇 |
1985年 | 41301篇 |
1984年 | 30264篇 |
1983年 | 25662篇 |
1982年 | 14306篇 |
1979年 | 26212篇 |
1978年 | 17969篇 |
1977年 | 15216篇 |
1976年 | 14113篇 |
1975年 | 14827篇 |
1974年 | 17983篇 |
1973年 | 17272篇 |
1972年 | 15989篇 |
1971年 | 14754篇 |
1970年 | 13659篇 |
1969年 | 12746篇 |
排序方式: 共有10000条查询结果,搜索用时 359 毫秒
101.
102.
Monika Scheer Christian Vokuhl Iris Veit‐Friedrich Marc Münter Thekla von Kalle Michael Greulich Steffan Loff Sabine Stegmaier Monika Sparber‐Sauer Felix Niggli Ruth Ladenstein Bernarda Kazanowska Gustaf Ljungman Kirsi Jahnukainen Jrg Fuchs Stefan S. Bielack Ewa Koscielniak Thomas Klingebiel 《Pediatric blood & cancer》2020,67(2)
103.
Provocation of Atrial Fibrillation Triggers During Ablation: Does the Use of General Anesthesia Affect Inducibility? 下载免费PDF全文
104.
Changhyun Kim B.S. Brittany G. Craiglow M.D. Kalman L. Watsky M.D. Richard J. Antaya M.D. 《Pediatric dermatology》2015,32(4):e161-e162
A 17‐year‐old boy presented with recurring severe dermatitis of the face of 5‐months duration that resembled impetigo. He had been treated with several courses of antibiotics without improvement. Biopsy showed changes consistent with allergic contact dermatitis and patch testing later revealed sensitization to benzoyl peroxide, which the patient had been using for the treatment of acne vulgaris. 相似文献
105.
106.
107.
Francois Rheault Alessandro De Benedictis Alessandro Daducci Chiara Maffei Chantal M. W. Tax David Romascano Eduardo Caverzasi Felix C. Morency Francesco Corrivetti Franco Pestilli Gabriel Girard Guillaume Theaud Ilyess Zemmoura Janice Hau Kelly Glavin Kesshi M. Jordan Kristofer Pomiecko Maxime Chamberland Muhamed Barakovic Nil Goyette Philippe Poulin Quentin Chenot Sandip S. Panesar Silvio Sarubbo Laurent Petit Maxime Descoteaux 《Human brain mapping》2020,41(7):1859-1874
Investigative studies of white matter (WM) brain structures using diffusion MRI (dMRI) tractography frequently require manual WM bundle segmentation, often called “virtual dissection.” Human errors and personal decisions make these manual segmentations hard to reproduce, which have not yet been quantified by the dMRI community. It is our opinion that if the field of dMRI tractography wants to be taken seriously as a widespread clinical tool, it is imperative to harmonize WM bundle segmentations and develop protocols aimed to be used in clinical settings. The EADC‐ADNI Harmonized Hippocampal Protocol achieved such standardization through a series of steps that must be reproduced for every WM bundle. This article is an observation of the problematic. A specific bundle segmentation protocol was used in order to provide a real‐life example, but the contribution of this article is to discuss the need for reproducibility and standardized protocol, as for any measurement tool. This study required the participation of 11 experts and 13 nonexperts in neuroanatomy and “virtual dissection” across various laboratories and hospitals. Intra‐rater agreement (Dice score) was approximately 0.77, while inter‐rater was approximately 0.65. The protocol provided to participants was not necessarily optimal, but its design mimics, in essence, what will be required in future protocols. Reporting tractometry results such as average fractional anisotropy, volume or streamline count of a particular bundle without a sufficient reproducibility score could make the analysis and interpretations more difficult. Coordinated efforts by the diffusion MRI tractography community are needed to quantify and account for reproducibility of WM bundle extraction protocols in this era of open and collaborative science. 相似文献
108.
Maaike van Gerwen MD Naomi Alpert MS Raja Flores MD Emanuela Taioli MD PhD 《American journal of industrial medicine》2020,63(2):115-120
The association between asbestos exposure, mainly in occupational settings, and malignant mesothelioma has been well established; this has prompted several countries to establish mesothelioma epidemiologic surveillance programs often at the request of national agencies. This review compares currently existing mesothelioma registries worldwide to develop a concept model for a US real-time case capture mesothelioma registry. Five countries were identified with a mesothelioma specific registry, including Italy, France, UK, Australia, and South Korea. All, except the UK, used interviews to collect exposure data. Linkage with the national death index was available or was in future plans for all registries. The registries have limited information on treatment, quality of life, and other patient-centered outcomes such as symptoms and pain management. To thoroughly collect exposure data, “real-time” enrollment is preferable; to maximize the capture of mesothelioma cases, optimal coverage, and a simplified consent process are needed. 相似文献
109.
Assessment of Myocardial Infarct Size by Three‐Dimensional and Two‐Dimensional Speckle Tracking Echocardiography: A Comparative Study to Single Photon Emission Computed Tomography 下载免费PDF全文
110.