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   4921617篇
  免费   392931篇
  国内免费   15559篇
耳鼻咽喉   69137篇
儿科学   158092篇
妇产科学   130068篇
基础医学   740709篇
口腔科学   137165篇
临床医学   453186篇
内科学   898765篇
皮肤病学   117090篇
神经病学   413220篇
特种医学   193378篇
外国民族医学   968篇
外科学   739905篇
综合类   138879篇
现状与发展   24篇
一般理论   2811篇
预防医学   410231篇
眼科学   115626篇
药学   351606篇
  21篇
中国医学   12989篇
肿瘤学   246237篇
  2021年   56868篇
  2019年   59318篇
  2018年   76138篇
  2017年   58063篇
  2016年   64465篇
  2015年   76897篇
  2014年   111391篇
  2013年   177099篇
  2012年   140258篇
  2011年   148171篇
  2010年   130971篇
  2009年   130950篇
  2008年   133504篇
  2007年   143335篇
  2006年   150897篇
  2005年   145113篇
  2004年   145927篇
  2003年   135773篇
  2002年   124382篇
  2001年   197240篇
  2000年   194202篇
  1999年   174292篇
  1998年   75857篇
  1997年   70575篇
  1996年   68754篇
  1995年   64333篇
  1994年   58171篇
  1993年   53996篇
  1992年   128558篇
  1991年   123373篇
  1990年   118820篇
  1989年   115364篇
  1988年   106256篇
  1987年   104309篇
  1986年   98408篇
  1985年   95817篇
  1984年   77783篇
  1983年   68458篇
  1982年   51624篇
  1981年   47707篇
  1980年   44728篇
  1979年   67688篇
  1978年   53044篇
  1977年   46610篇
  1976年   43239篇
  1975年   44061篇
  1974年   48990篇
  1973年   46930篇
  1972年   43930篇
  1971年   40622篇
排序方式: 共有10000条查询结果,搜索用时 21 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