全文获取类型
收费全文 | 53197篇 |
免费 | 4285篇 |
国内免费 | 108篇 |
专业分类
耳鼻咽喉 | 402篇 |
儿科学 | 1965篇 |
妇产科学 | 2452篇 |
基础医学 | 5896篇 |
口腔科学 | 604篇 |
临床医学 | 11373篇 |
内科学 | 9224篇 |
皮肤病学 | 755篇 |
神经病学 | 4670篇 |
特种医学 | 896篇 |
外国民族医学 | 33篇 |
外科学 | 4495篇 |
综合类 | 612篇 |
一般理论 | 79篇 |
预防医学 | 7211篇 |
眼科学 | 535篇 |
药学 | 2805篇 |
1篇 | |
中国医学 | 87篇 |
肿瘤学 | 3495篇 |
出版年
2023年 | 450篇 |
2022年 | 223篇 |
2021年 | 1003篇 |
2020年 | 771篇 |
2019年 | 1096篇 |
2018年 | 1390篇 |
2017年 | 1041篇 |
2016年 | 1230篇 |
2015年 | 1258篇 |
2014年 | 1681篇 |
2013年 | 2700篇 |
2012年 | 3505篇 |
2011年 | 3826篇 |
2010年 | 2126篇 |
2009年 | 2145篇 |
2008年 | 3389篇 |
2007年 | 3807篇 |
2006年 | 3648篇 |
2005年 | 3522篇 |
2004年 | 3428篇 |
2003年 | 3241篇 |
2002年 | 3045篇 |
2001年 | 461篇 |
2000年 | 304篇 |
1999年 | 487篇 |
1998年 | 754篇 |
1997年 | 609篇 |
1996年 | 475篇 |
1995年 | 454篇 |
1994年 | 427篇 |
1993年 | 405篇 |
1992年 | 298篇 |
1991年 | 278篇 |
1990年 | 275篇 |
1989年 | 205篇 |
1988年 | 199篇 |
1987年 | 206篇 |
1986年 | 177篇 |
1985年 | 215篇 |
1984年 | 218篇 |
1983年 | 225篇 |
1982年 | 279篇 |
1981年 | 255篇 |
1980年 | 199篇 |
1979年 | 139篇 |
1978年 | 125篇 |
1977年 | 132篇 |
1976年 | 119篇 |
1975年 | 92篇 |
1973年 | 86篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
2.
Rupa Narayan MD Traci M. Blonquist MS Ashkan Emadi MD PhD Robert P. Hasserjian MD Meghan Burke BS Christopher Lescinskas BS Donna S. Neuberg ScD Andrew M. Brunner MD Gabriela Hobbs MD Hanno Hock MD PhD Steven L. McAfee MD Yi-Bin Chen MD Eyal Attar MD Timothy A. Graubert MD Christina Bertoli MSN Jenna A. Moran MSN Meghan K. Bergeron MSN Julia E. Foster MSN Aura Y. Ramos BSN Tina T. Som BSN Megan K. Vartanian BSN RN Jennifer L. Story LPN Kristin McGregor MS Molly Macrae BS Tanya Behnan BS Margaret C. Wey PhD Jessica Rae BSN Frederic I. Preffer PhD Patricia Lesho BA Vu H. Duong MD Mason L. Mann BA Karen K. Ballen MD Christine Connolly BS Philip C. Amrein MD Amir T. Fathi MD 《Cancer》2020,126(6):1264-1273
3.
Danielle E Whittier Elizabeth J Samelson Marian T Hannan Lauren A Burt David A Hanley Emmanuel Biver Pawel Szulc Elisabeth Sornay-Rendu Blandine Merle Roland Chapurlat Eric Lespessailles Andy Kin On Wong David Goltzman Sundeep Khosla Serge Ferrari Mary L Bouxsein Douglas P Kiel Steven K Boyd 《Journal of bone and mineral research》2022,37(3):428-439
Prevalence of osteoporosis is more than 50% in older adults, yet current clinical methods for diagnosis that rely on areal bone mineral density (aBMD) fail to detect most individuals who have a fragility fracture. Bone fragility can manifest in different forms, and a “one-size-fits-all” approach to diagnosis and management of osteoporosis may not be suitable. High-resolution peripheral quantitative computed tomography (HR-pQCT) provides additive information by capturing information about volumetric density and microarchitecture, but interpretation is challenging because of the complex interactions between the numerous properties measured. In this study, we propose that there are common combinations of bone properties, referred to as phenotypes, that are predisposed to different levels of fracture risk. Using HR-pQCT data from a multinational cohort (n = 5873, 71% female) between 40 and 96 years of age, we employed fuzzy c-means clustering, an unsupervised machine-learning method, to identify phenotypes of bone microarchitecture. Three clusters were identified, and using partial correlation analysis of HR-pQCT parameters, we characterized the clusters as low density, low volume, and healthy bone phenotypes. Most males were associated with the healthy bone phenotype, whereas females were more often associated with the low volume or low density bone phenotypes. Each phenotype had a significantly different cumulative hazard of major osteoporotic fracture (MOF) and of any incident osteoporotic fracture (p < 0.05). After adjustment for covariates (cohort, sex, and age), the low density followed by the low volume phenotype had the highest association with MOF (hazard ratio = 2.96 and 2.35, respectively), and significant associations were maintained when additionally adjusted for femoral neck aBMD (hazard ratio = 1.69 and 1.90, respectively). Further, within each phenotype, different imaging biomarkers of fracture were identified. These findings suggest that osteoporotic fracture risk is associated with bone phenotypes that capture key features of bone deterioration that are not distinguishable by aBMD. © 2021 American Society for Bone and Mineral Research (ASBMR). 相似文献
4.
5.
Quality of life in stroke survivor–caregiver dyads: a new conceptual framework and longitudinal study protocol 下载免费PDF全文
6.
7.
8.
9.
Sebastian P. Mondaca MD Dazhi Liu PharmD BCOP Jessica R. Flynn Sandy Badson Stefan Hamaway BS Mrinal M. Gounder MD Danny N. Khalil MD PhD Alexander E. Drilon MD Bob T. Li MD MPH Komal L. Jhaveri MD Alison M. Schram MD Katherine E. Kargus RN Mary Kate Kasler DNP MSN Natalie M. Blauvelt Neil H. Segal MD PhD Marinela Capanu PhD Margaret K. Callahan MD PhD David M. Hyman MD Maya Gambarin-Gelwan MD James J. Harding MD 《Cancer》2020,126(22):4967-4974
10.