首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   526517篇
  免费   35022篇
  国内免费   643篇
耳鼻咽喉   6997篇
儿科学   17153篇
妇产科学   13864篇
基础医学   86681篇
口腔科学   14774篇
临床医学   45748篇
内科学   96555篇
皮肤病学   12380篇
神经病学   37401篇
特种医学   18971篇
外国民族医学   63篇
外科学   78992篇
综合类   8748篇
一般理论   129篇
预防医学   39968篇
眼科学   12413篇
药学   41382篇
中国医学   1014篇
肿瘤学   28949篇
  2018年   5195篇
  2016年   4256篇
  2015年   4721篇
  2014年   6404篇
  2013年   10260篇
  2012年   13652篇
  2011年   15181篇
  2010年   8779篇
  2009年   8209篇
  2008年   14502篇
  2007年   15574篇
  2006年   15822篇
  2005年   15219篇
  2004年   14802篇
  2003年   14136篇
  2002年   14006篇
  2001年   24227篇
  2000年   25219篇
  1999年   20706篇
  1998年   5594篇
  1997年   4826篇
  1996年   5166篇
  1995年   4746篇
  1994年   4433篇
  1992年   15865篇
  1991年   16429篇
  1990年   16514篇
  1989年   15908篇
  1988年   14696篇
  1987年   14515篇
  1986年   13708篇
  1985年   13103篇
  1984年   9782篇
  1983年   8372篇
  1982年   4687篇
  1981年   4336篇
  1979年   9474篇
  1978年   6919篇
  1977年   5834篇
  1976年   5676篇
  1975年   6432篇
  1974年   7695篇
  1973年   7171篇
  1972年   7004篇
  1971年   6716篇
  1970年   6206篇
  1969年   5916篇
  1968年   5580篇
  1967年   5037篇
  1966年   4486篇
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
1.
2.
Gestational trophoblastic neoplasia (GTN) patients are treated according to the eight-variable International Federation of Gynaecology and Obstetrics (FIGO) scoring system, that aims to predict first-line single-agent chemotherapy resistance. FIGO is imperfect with one-third of low-risk patients developing disease resistance to first-line single-agent chemotherapy. We aimed to generate simplified models that improve upon FIGO. Logistic regression (LR) and multilayer perceptron (MLP) modelling (n = 4191) generated six models (M1-6). M1, all eight FIGO variables (scored data); M2, all eight FIGO variables (scored and raw data); M3, nonimaging variables (scored data); M4, nonimaging variables (scored and raw data); M5, imaging variables (scored data); and M6, pretreatment hCG (raw data) + imaging variables (scored data). Performance was compared to FIGO using true and false positive rates, positive and negative predictive values, diagnostic odds ratio, receiver operating characteristic (ROC) curves, Bland-Altman calibration plots, decision curve analysis and contingency tables. M1-6 were calibrated and outperformed FIGO on true positive rate and positive predictive value. Using LR and MLP, M1, M2 and M4 generated small improvements to the ROC curve and decision curve analysis. M3, M5 and M6 matched FIGO or performed less well. Compared to FIGO, most (excluding LR M4 and MLP M5) had significant discordance in patient classification (McNemar's test P < .05); 55-112 undertreated, 46-206 overtreated. Statistical modelling yielded only small gains over FIGO performance, arising through recategorisation of treatment-resistant patients, with a significant proportion of under/overtreatment as the available data have been used a priori to allocate primary chemotherapy. Streamlining FIGO should now be the focus.  相似文献   
3.
Maternal and Child Health Journal - Early life exposures can have an impact on a child’s developmental trajectory and children born late preterm (34–36&nbsp;weeks gestational age)...  相似文献   
4.
5.
6.
7.
8.
9.
10.
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   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号