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   2919094篇
  免费   208843篇
  国内免费   4883篇
耳鼻咽喉   40957篇
儿科学   94139篇
妇产科学   80138篇
基础医学   426564篇
口腔科学   80550篇
临床医学   260626篇
内科学   565399篇
皮肤病学   63912篇
神经病学   230808篇
特种医学   110723篇
外国民族医学   801篇
外科学   443183篇
综合类   61615篇
现状与发展   12篇
一般理论   1053篇
预防医学   225766篇
眼科学   68317篇
药学   215994篇
  11篇
中国医学   5743篇
肿瘤学   156509篇
  2019年   23242篇
  2018年   32158篇
  2017年   24428篇
  2016年   27166篇
  2015年   30658篇
  2014年   43460篇
  2013年   65596篇
  2012年   89955篇
  2011年   95775篇
  2010年   57147篇
  2009年   54041篇
  2008年   90327篇
  2007年   96061篇
  2006年   97193篇
  2005年   94398篇
  2004年   90299篇
  2003年   87091篇
  2002年   84827篇
  2001年   131544篇
  2000年   134996篇
  1999年   113987篇
  1998年   33045篇
  1997年   29298篇
  1996年   29477篇
  1995年   27690篇
  1994年   25654篇
  1993年   24219篇
  1992年   88753篇
  1991年   86151篇
  1990年   84379篇
  1989年   81252篇
  1988年   74896篇
  1987年   73644篇
  1986年   69348篇
  1985年   66407篇
  1984年   49632篇
  1983年   42327篇
  1982年   25302篇
  1979年   45821篇
  1978年   32649篇
  1977年   27231篇
  1976年   25982篇
  1975年   28101篇
  1974年   33867篇
  1973年   32356篇
  1972年   30341篇
  1971年   28559篇
  1970年   26628篇
  1969年   25227篇
  1968年   23414篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
151.
152.
As countries implement Article 11 of the World Health Organization (WHO) Framework Convention on Tobacco Control, graphic warning labels that use images of people and their body parts to illustrate the consequences of smoking are being added to cigarette packs. According to exemplification theory, these case examples—exemplars—can shape perceptions about risk and may resonate differently among demographic subpopulations. Drawing on data from eight focus groups (N = 63) with smokers and nonsmokers from vulnerable populations, this qualitative study explores whether people considered exemplars in their reactions to and evaluations of U.S. graphic health warning labels initially proposed by the Food and Drug Administration. Participants made reference to prior and concurrent mass media messages and exemplars during the focus groups and used demographic cues in making sense of the images on the warning labels. Participants were particularly sensitive to age of the exemplars and how it might affect label effectiveness and beliefs about smoking. Race and socioeconomic status also were salient for some participants. We recommend that exemplars and exemplification be considered when selecting and evaluating graphic health warnings for tobacco labels and associated media campaigns.  相似文献   
153.
154.
155.
156.
157.
Objective Consensus that enhanced teamwork is necessary for efficient and effective primary care delivery is growing. We sought to identify how electronic health records (EHRs) facilitate and pose challenges to primary care teams as well as how practices are overcoming these challenges.Methods Practices in this qualitative study were selected from those recognized as patient-centered medical homes via the National Committee for Quality Assurance 2011 tool, which included a section on practice teamwork. We interviewed 63 respondents, ranging from physicians to front-desk staff, from 27 primary care practices ranging in size, type, geography, and population size.Results EHRs were found to facilitate communication and task delegation in primary care teams through instant messaging, task management software, and the ability to create evidence-based templates for symptom-specific data collection from patients by medical assistants and nurses (which can offload work from physicians). Areas where respondents felt that electronic medical record EHR functionalities were weakest and posed challenges to teamwork included the lack of integrated care manager software and care plans in EHRs, poor practice registry functionality and interoperability, and inadequate ease of tracking patient data in the EHR over time.Discussion Practices developed solutions for some of the challenges they faced when attempting to use EHRs to support teamwork but wanted more permanent vendor and policy solutions for other challenges.Conclusions EHR vendors in the United States need to work alongside practicing primary care teams to create more clinically useful EHRs that support dynamic care plans, integrated care management software, more functional and interoperable practice registries, and greater ease of data tracking over time.  相似文献   
158.
159.
160.
Traditionally, major complications and unanticipated admission/readmission rates were used to assess outcome after day surgery. However, in view of the relative absence of major complications the quality of recovery (QOR) should be considered one of the principal endpoints after day surgery. In our study, the level of QOR is defined by a combination of the Global Surgical Recovery (GSR) Index and the Quality of Life (QOL).The aim of this study was to analyze prevalence and predictors of QOR after day surgery on the fourth postoperative day.Elective patients scheduled for day surgery from November 2008 to April 2010 were enrolled in a prospective cohort study. Outcome parameters were measured by using questionnaire packages at 2 time points: 1 week preoperatively and 4 days postoperatively. Primary outcome parameter is the QOR and is defined as good if the GSR index >80% as well as the postoperative QOL is unchanged or improved as compared with baseline. QOR is defined as poor if both the GSR index ≤80% and if the postoperative QOL is decreased as compared with baseline. QOR is defined as intermediate in all other cases. Three logistic regression analyses were performed to determine predictors for poor QOR after day surgery.A total of 1118 patients were included. A good QOR was noted in 17.3% of patients, an intermediate QOR in 34.8%, and a poor QOR in 47.8% 4 days after day surgery. The best predictor for poor QOR after day surgery was type of surgery. Other predictors were younger age, work status, and longer duration of surgery. A history of previous surgery, expected pain (by the patient) and high long-term surgical fear were significant predictors of poor QOR in only 1 of 3 prediction models.The QOR at home 4 days after day surgery was poor in the majority of patients and showed a significant procedure-specific variation. Patients at risk for poor QOR can be identified during the preoperative period based on type of surgery, age, work status, and the duration of the surgery.  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