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   1336974篇
  免费   94087篇
  国内免费   2908篇
耳鼻咽喉   19715篇
儿科学   40278篇
妇产科学   38714篇
基础医学   187350篇
口腔科学   39848篇
临床医学   112692篇
内科学   262499篇
皮肤病学   30217篇
神经病学   106431篇
特种医学   53677篇
外国民族医学   435篇
外科学   208300篇
综合类   31078篇
现状与发展   6篇
一般理论   436篇
预防医学   92152篇
眼科学   31362篇
药学   100110篇
  4篇
中国医学   3018篇
肿瘤学   75647篇
  2018年   11754篇
  2015年   11886篇
  2014年   16706篇
  2013年   25270篇
  2012年   33039篇
  2011年   34915篇
  2010年   20754篇
  2009年   20244篇
  2008年   33620篇
  2007年   36712篇
  2006年   37277篇
  2005年   36048篇
  2004年   35120篇
  2003年   34093篇
  2002年   33614篇
  2001年   63643篇
  2000年   65355篇
  1999年   55415篇
  1998年   14670篇
  1997年   13470篇
  1996年   12946篇
  1995年   12231篇
  1994年   11478篇
  1992年   42776篇
  1991年   41294篇
  1990年   40570篇
  1989年   39572篇
  1988年   36973篇
  1987年   36417篇
  1986年   34923篇
  1985年   33114篇
  1984年   24830篇
  1983年   21060篇
  1982年   12674篇
  1981年   11578篇
  1980年   10777篇
  1979年   23930篇
  1978年   17078篇
  1977年   14842篇
  1976年   13392篇
  1975年   15275篇
  1974年   18086篇
  1973年   17573篇
  1972年   16813篇
  1971年   15725篇
  1970年   14915篇
  1969年   14351篇
  1968年   13464篇
  1967年   12018篇
  1966年   11263篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
81.
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   
82.
83.
84.
85.
86.
87.
88.
89.
Introduction: Tamoxifen dominates the anti-estrogenic therapy in the early and metastatic breast cancer setting. Tamoxifen has a complex metabolism, being mainly metabolized by CYP2D6 into its 30–100 times more potent metabolite, endoxifen. Recently, a phase I study in which endoxifen as an orally z-endoxifen hydrochloride has been successfully evaluated.

Areas covered: the principal pharmacogenetic and non-genetic differences in the pharmacology of tamoxifen and endoxifen are evaluated. To this end, references from PubMed, Embase or Web of Science, among others, were reviewed As non-genetic factors, important differences and similarities such age, or adherence to tamoxifen therapy are comprehensively illustrated. Additionally, since CYP2D6 genotypes are considered the main limitation of tamoxifen, many studies have investigated the association between the worsened clinical outcomes in patients with non-functional CYP2D6 genotypes. In this review, an overview of the research on this field is presented. Also, a summary describing the literature about individualizing tamoxifen therapy with endoxifen concentrations and its limitations is listed.

Expert opinion: z-endoxifen hydrochloride is only investigated in the metastatic setting, still more research is required before its place in therapeutics is known. Similarly, monitoring tamoxifen efficacy based on endoxifen concentrations might not be overall recommended due to the limited evidence available.  相似文献   

90.

BACKGROUND

Online physician rating websites are increasingly used by patients to evaluate their doctors. The purpose of this investigation was to evaluate factors associated with better spine surgeon ratings.

METHODS

Orthopedic spine surgeons were randomly selected from the North American Spine Society directory utilizing a random number generator. Surgeon profiles on three physician rating websites, namely, www.HealthGrades.com, www.Vitals.com, and www.RateMDs.com, were analyzed to gather qualitative and quantitative data on patients’ perceptions of the surgeons. Independent variables from the websites were analyzed in relation to overall physician or patient satisfaction rating. Comments were coded by subject into following three categories: professional competence, bedside manner, and practice characteristics.

RESULTS

A total of 250 surgeons were evaluated, and 92% (n=230) of these doctors had at least one rating among the three websites. The surgeons with a higher average rating had significantly better trust (p<.01), scheduling (p<.01), staff (p<.01), helpfulness (p<.01), and punctuality (p<.01) scores but significantly less experience (p<.05). A linear regression model for the average rating of each surgeon (R2 value=0.754) yielded only following three significant variables: trustworthiness (p<.01), experience match (p<.05), and the average number of negative comments on surgeon's professional competence (p<.05). Trustworthiness (β=0.749) was the strongest predictor variable of physician rating, followed by the number of negative professional competence comments (β=?0.132) and experience match (β=?0.112).

CONCLUSIONS

This investigation assessed spine surgeon online patient ratings and categorized factors that patients associate with quality care. Trustworthiness was the most significant predictor of positive ratings, whereas ease of scheduling, quality of staff, helpfulness, and punctuality were also associated with higher patient ratings. Understanding what patients value may help optimize care of spine surgery patients.  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