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   4919825篇
  免费   392936篇
  国内免费   15558篇
耳鼻咽喉   69242篇
儿科学   158064篇
妇产科学   130205篇
基础医学   740381篇
口腔科学   137154篇
临床医学   452957篇
内科学   898372篇
皮肤病学   117072篇
神经病学   413191篇
特种医学   193396篇
外国民族医学   968篇
外科学   739297篇
综合类   138849篇
现状与发展   24篇
一般理论   2809篇
预防医学   409960篇
眼科学   115583篇
药学   351646篇
  21篇
中国医学   12984篇
肿瘤学   246144篇
  2021年   56974篇
  2019年   59351篇
  2018年   76190篇
  2017年   58085篇
  2016年   64479篇
  2015年   76915篇
  2014年   111412篇
  2013年   177146篇
  2012年   140351篇
  2011年   148257篇
  2010年   130998篇
  2009年   130980篇
  2008年   133556篇
  2007年   143452篇
  2006年   150984篇
  2005年   145228篇
  2004年   146027篇
  2003年   135895篇
  2002年   124476篇
  2001年   197242篇
  2000年   194199篇
  1999年   174292篇
  1998年   75860篇
  1997年   70573篇
  1996年   68760篇
  1995年   64335篇
  1994年   58171篇
  1993年   53996篇
  1992年   128557篇
  1991年   123376篇
  1990年   118818篇
  1989年   115363篇
  1988年   106259篇
  1987年   104313篇
  1986年   98410篇
  1985年   95822篇
  1984年   77784篇
  1983年   68454篇
  1982年   51625篇
  1981年   47709篇
  1980年   44730篇
  1979年   67685篇
  1978年   53042篇
  1977年   46607篇
  1976年   43238篇
  1975年   43950篇
  1974年   48751篇
  1973年   46735篇
  1972年   43832篇
  1971年   40501篇
排序方式: 共有10000条查询结果,搜索用时 328 毫秒
991.
Pediatric dermatology is one of the smallest subspecialties, and expanding the availability of care is of great interest. Teledermatology has been proposed as a way to expand access and improve care delivery, but no current assessment of pediatric teledermatology exists. The objective of the current study was to assess usage and perspectives on pediatric teledermatology. Surveys were distributed electronically to all 226 board‐certified U.S. pediatric dermatologists; 44% (100/226) responded. Nearly all respondents (89%) have experience with teledermatology. Formal teledermatology reimbursement success rates have increased to 35%. Respondents were positive about teledermatology's present and future prospects, and 41% want to use teledermatology more often, although they viewed teledermatology as somewhat inferior to in‐person care regarding accuracy of diagnosis and appropriation of management plans. Significant differences were found between formal teledermatology users and nonusers in salary structure, practice environment, sex, and region. Substantial increases in pediatric teledermatology have occurred in the last 5 to 10 years, and there remains cause for optimism for teledermatology's future. Concerns about diagnostic confidence and care quality indicate that teledermatology may be best for care of patients with characteristic clinical presentations or management of patients with established diagnoses.  相似文献   
992.
We present the case of 7‐year‐old African American girl with loose anagen syndrome. Although this is a common cause of hair loss in Caucasian children, and there have been reports of cases occurring in dark‐skinned children of North African and Middle Eastern descent, to our knowledge there have been no cases reported in black children of sub‐Saharan African ancestry. We present this case to broaden the differential diagnosis of hair loss in African Americans.  相似文献   
993.
994.
995.
996.
997.
998.
999.
Background  Machine learning (ML) has captured the attention of many clinicians who may not have formal training in this area but are otherwise increasingly exposed to ML literature that may be relevant to their clinical specialties. ML papers that follow an outcomes-based research format can be assessed using clinical research appraisal frameworks such as PICO (Population, Intervention, Comparison, Outcome). However, the PICO frameworks strain when applied to ML papers that create new ML models, which are akin to diagnostic tests. There is a need for a new framework to help assess such papers. Objective  We propose a new framework to help clinicians systematically read and evaluate medical ML papers whose aim is to create a new ML model: ML-PICO (Machine Learning, Population, Identification, Crosscheck, Outcomes). We describe how the ML-PICO framework can be applied toward appraising literature describing ML models for health care. Conclusion  The relevance of ML to practitioners of clinical medicine is steadily increasing with a growing body of literature. Therefore, it is increasingly important for clinicians to be familiar with how to assess and best utilize these tools. In this paper we have described a practical framework on how to read ML papers that create a new ML model (or diagnostic test): ML-PICO. We hope that this can be used by clinicians to better evaluate the quality and utility of ML papers.  相似文献   
1000.
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