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   4271417篇
  免费   361183篇
  国内免费   15246篇
耳鼻咽喉   61084篇
儿科学   133129篇
妇产科学   111841篇
基础医学   655918篇
口腔科学   118807篇
临床医学   387891篇
内科学   775188篇
皮肤病学   103257篇
神经病学   367126篇
特种医学   170958篇
外国民族医学   912篇
外科学   653288篇
综合类   126138篇
现状与发展   23篇
一般理论   2609篇
预防医学   360402篇
眼科学   100490篇
药学   302309篇
  21篇
中国医学   11356篇
肿瘤学   205099篇
  2021年   55720篇
  2020年   35526篇
  2019年   58655篇
  2018年   73315篇
  2017年   55606篇
  2016年   61959篇
  2015年   75219篇
  2014年   110009篇
  2013年   175340篇
  2012年   118420篇
  2011年   121565篇
  2010年   123121篇
  2009年   126169篇
  2008年   108695篇
  2007年   115280篇
  2006年   124755篇
  2005年   119935篇
  2004年   120710篇
  2003年   111412篇
  2002年   102005篇
  2001年   154353篇
  2000年   150502篇
  1999年   139578篇
  1998年   71296篇
  1997年   67775篇
  1996年   65650篇
  1995年   61509篇
  1994年   55585篇
  1993年   51618篇
  1992年   103600篇
  1991年   98974篇
  1990年   94081篇
  1989年   91704篇
  1988年   85329篇
  1987年   83790篇
  1986年   79486篇
  1985年   77924篇
  1984年   65957篇
  1983年   58868篇
  1982年   48145篇
  1981年   44885篇
  1980年   42179篇
  1979年   57839篇
  1978年   47037篇
  1977年   41600篇
  1976年   38657篇
  1975年   37853篇
  1974年   42428篇
  1973年   40558篇
  1972年   38029篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
971.
We report a case of dichorionic, diamniotic twins who developed similar erythematous, annular, erosive plaques in the inguinal folds in the first few weeks of life that were refractory to topical antifungals and oral antibiotics. The twins were found to have high transaminase levels, antinuclear antibody positivity, and anti‐SSS/Ro) and anti‐SSB/La autoantibodies. The rash resolved without scarring by 7 months of age with the use of low‐potency topical corticosteroids. We suggest that physicians consider neonatal lupus erythematosus in neonates with atypical eruptions occurring in sun‐protected skin.  相似文献   
972.
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   
973.
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   
974.
975.
976.
977.
978.
979.
980.
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   
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