全文获取类型
收费全文 | 19172篇 |
免费 | 1816篇 |
国内免费 | 38篇 |
专业分类
耳鼻咽喉 | 110篇 |
儿科学 | 803篇 |
妇产科学 | 584篇 |
基础医学 | 2695篇 |
口腔科学 | 457篇 |
临床医学 | 2594篇 |
内科学 | 3638篇 |
皮肤病学 | 204篇 |
神经病学 | 1417篇 |
特种医学 | 486篇 |
外国民族医学 | 1篇 |
外科学 | 2200篇 |
综合类 | 436篇 |
一般理论 | 19篇 |
预防医学 | 2531篇 |
眼科学 | 229篇 |
药学 | 1103篇 |
中国医学 | 13篇 |
肿瘤学 | 1506篇 |
出版年
2023年 | 104篇 |
2022年 | 137篇 |
2021年 | 386篇 |
2020年 | 300篇 |
2019年 | 465篇 |
2018年 | 461篇 |
2017年 | 387篇 |
2016年 | 387篇 |
2015年 | 416篇 |
2014年 | 564篇 |
2013年 | 904篇 |
2012年 | 1300篇 |
2011年 | 1379篇 |
2010年 | 758篇 |
2009年 | 697篇 |
2008年 | 1213篇 |
2007年 | 1226篇 |
2006年 | 1145篇 |
2005年 | 1125篇 |
2004年 | 1007篇 |
2003年 | 881篇 |
2002年 | 932篇 |
2001年 | 346篇 |
2000年 | 312篇 |
1999年 | 333篇 |
1998年 | 196篇 |
1997年 | 160篇 |
1996年 | 130篇 |
1995年 | 161篇 |
1994年 | 133篇 |
1993年 | 112篇 |
1992年 | 159篇 |
1991年 | 190篇 |
1990年 | 185篇 |
1989年 | 195篇 |
1988年 | 153篇 |
1987年 | 152篇 |
1986年 | 144篇 |
1985年 | 144篇 |
1984年 | 114篇 |
1983年 | 112篇 |
1982年 | 87篇 |
1981年 | 79篇 |
1980年 | 65篇 |
1979年 | 112篇 |
1978年 | 85篇 |
1977年 | 73篇 |
1974年 | 61篇 |
1973年 | 63篇 |
1972年 | 69篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
In clinical and epidemiological studies, there is a growing interest in studying the heterogeneity among patients based on longitudinal characteristics to identify subtypes of the study population. Compared to clustering a single longitudinal marker, simultaneously clustering multiple longitudinal markers allow additional information to be incorporated into the clustering process, which reveals co-existing longitudinal patterns and generates deeper biological insight. In the current study, we propose a Bayesian consensus clustering (BCC) model for multivariate longitudinal data. Instead of arriving at a single overall clustering, the proposed model allows each marker to follow marker-specific local clustering and these local clusterings are aggregated to find a global (consensus) clustering. To estimate the posterior distribution of model parameters, a Gibbs sampling algorithm is proposed. We apply our proposed model to the primary biliary cirrhosis study to identify patient subtypes that may be associated with their prognosis. We also perform simulation studies to compare the clustering performance between the proposed model and existing models under several scenarios. The results demonstrate that the proposed BCC model serves as a useful tool for clustering multivariate longitudinal data. 相似文献
2.
3.
Alexander E. J. Trevatt David R. Thomson Robert Miller Matthew Colquhoun Akinyemi I. Idowu Shakeel Rahman 《Journal of plastic surgery and hand surgery》2019,53(2):97-104
Academic output is just one aspect of a successful career as a plastic surgeon. However, for those with a strong interest in academia, the academic output of a department will likely be a key factor when deciding how to rank jobs. The aim of this study was to quantify and rank the academic output of plastic surgery units across the UK and Ireland. The Institute for Scientific Information (ISI) Web of Science Bibliometric analysis tool was used to collate cumulative (1950–2016), 10 year (2006–2016) and 3 years (2013–2015) research output data for plastic surgery units in the UK and Ireland. Sixty-six plastic surgery units were identified. Departments were ranked for each time period according to the number of papers produced, number of citations (Nc) and h-index (a measure of the impact of scientific output). The top 3 departments for number of papers in the last 10 years were The Royal Free Hospital, London (226) Broomfield Hospital, Chelmsford (218), and Morriston Hospital and Swansea (188). The top 3 for h-number were The Royal Free Hospital (21) Wythenshawe Hospital, Manchester (18) and Morriston Hospital (17). Academic output varies across plastic surgery units in the UK and Ireland. A number of departments have consistently maintained high academic outputs across the years and will be of interest to surgeons hoping to pursue a career in academia. 相似文献
4.
5.
6.
7.
8.
9.
10.
Molly Orcutt Wendy C. King Melissa A. Kalarchian Michael J. Devlin Marsha D. Marcus Luis Garcia Kristine J. Steffen James E. Mitchell 《Surgery for obesity and related diseases》2019,15(2):295-303