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   4934921篇
  免费   393511篇
  国内免费   15626篇
耳鼻咽喉   69283篇
儿科学   158457篇
妇产科学   130293篇
基础医学   742190篇
口腔科学   137420篇
临床医学   454912篇
内科学   902219篇
皮肤病学   117429篇
神经病学   414419篇
特种医学   193671篇
外国民族医学   968篇
外科学   740841篇
综合类   138980篇
现状与发展   24篇
一般理论   2813篇
预防医学   411735篇
眼科学   115860篇
药学   352365篇
  23篇
中国医学   13032篇
肿瘤学   247124篇
  2021年   57152篇
  2019年   59592篇
  2018年   76486篇
  2017年   58264篇
  2016年   64698篇
  2015年   77141篇
  2014年   111776篇
  2013年   177550篇
  2012年   141249篇
  2011年   149151篇
  2010年   131409篇
  2009年   131340篇
  2008年   134297篇
  2007年   144187篇
  2006年   151700篇
  2005年   145908篇
  2004年   146600篇
  2003年   136438篇
  2002年   125013篇
  2001年   197278篇
  2000年   194235篇
  1999年   174340篇
  1998年   75913篇
  1997年   70624篇
  1996年   68791篇
  1995年   64373篇
  1994年   58199篇
  1993年   54023篇
  1992年   128572篇
  1991年   123382篇
  1990年   118835篇
  1989年   115377篇
  1988年   106264篇
  1987年   104316篇
  1986年   98418篇
  1985年   95830篇
  1984年   77794篇
  1983年   68461篇
  1982年   51634篇
  1981年   47717篇
  1980年   44740篇
  1979年   67690篇
  1978年   53050篇
  1977年   46608篇
  1976年   43243篇
  1975年   44068篇
  1974年   48994篇
  1973年   46933篇
  1972年   43929篇
  1971年   40619篇
排序方式: 共有10000条查询结果,搜索用时 640 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