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   900042篇
  免费   63641篇
  国内免费   2327篇
耳鼻咽喉   12491篇
儿科学   28723篇
妇产科学   26180篇
基础医学   126791篇
口腔科学   24853篇
临床医学   74803篇
内科学   183384篇
皮肤病学   19004篇
神经病学   71486篇
特种医学   36487篇
外国民族医学   336篇
外科学   142367篇
综合类   19026篇
一般理论   247篇
预防医学   64693篇
眼科学   20118篇
药学   63903篇
中国医学   1811篇
肿瘤学   49307篇
  2018年   9109篇
  2017年   7200篇
  2016年   7721篇
  2015年   8785篇
  2014年   12444篇
  2013年   19313篇
  2012年   25797篇
  2011年   27406篇
  2010年   16657篇
  2009年   15857篇
  2008年   26226篇
  2007年   27860篇
  2006年   28037篇
  2005年   27550篇
  2004年   26358篇
  2003年   25537篇
  2002年   25143篇
  2001年   41410篇
  2000年   42588篇
  1999年   36307篇
  1998年   9973篇
  1997年   9161篇
  1996年   9085篇
  1995年   8454篇
  1994年   8090篇
  1993年   7592篇
  1992年   28214篇
  1991年   27006篇
  1990年   26435篇
  1989年   25356篇
  1988年   23562篇
  1987年   23177篇
  1986年   22256篇
  1985年   21164篇
  1984年   15820篇
  1983年   13483篇
  1982年   8091篇
  1979年   14597篇
  1978年   10215篇
  1977年   8630篇
  1976年   8155篇
  1975年   8964篇
  1974年   10703篇
  1973年   10192篇
  1972年   9667篇
  1971年   8926篇
  1970年   8590篇
  1969年   8029篇
  1968年   7692篇
  1967年   7091篇
排序方式: 共有10000条查询结果,搜索用时 953 毫秒
91.
92.

Purpose

A hydrogel rectal spacer (HRS) is a medical device that is approved by the U.S. Food and Drug Administration to increase the separation between the prostate and rectum. We conducted a cost-effectiveness analysis of HRS use for reduction in radiation therapy (RT) toxicities in patients with prostate cancer (PC) undergoing external beam RT (EBRT).

Methods and Materials

A multistate Markov model was constructed from the U.S. payer perspective to examine the cost-effectiveness of HRS in men with localized PC receiving EBRT (EBRT alone vs EBRT + HRS). The subgroups analyzed included site of HRS placement (hospital outpatient, physician office, ambulatory surgery center) and proportion of patients with good baseline erectile function (EF). Data on EF, gastrointestinal and genitourinary toxicities incidence, and potential risks associated with HRS implantation were obtained from a recently published randomized clinical trial. Health utilities and costs were derived from the literature and the 2018 Physician Fee Schedule and were discounted 3% annually. Quality-adjusted life years (QALYs) and costs were modeled for a 5-year period from receipt of RT. Probabilistic sensitivity analysis and value-based threshold analyses were conducted.

Results

The per-patient 5-year incremental cost for spacers administered in a hospital outpatient setting was $3578, and the incremental effectiveness was 0.0371 QALYs. The incremental cost-effectiveness ratio was $96,440/QALY for patients with PC undergoing HRS insertion in a hospital and $39,286/QALY for patients undergoing HRS insertion in an ambulatory facility. For men with good baseline EF, the incremental cost-effectiveness ratio was $35,548/QALY and $9627/QALY in hospital outpatient and ambulatory facility settings, respectively.

Conclusions

Based on the current Medicare Physician Fee Schedule, HRS is cost-effective at a willingness to pay threshold of $100,000. These results contain substantial uncertainty, suggesting more evidence is needed to refine future decision-making.  相似文献   
93.
94.
95.
96.

Objective

To examine the experience of interracial anxiety among health professionals and how it may affect the quality of their interactions with patients from racially marginalized populations. We explored the influence of prior interracial exposure—specifically through childhood neighborhoods, college student bodies, and friend groups—on interracial anxiety among medical students and residents. We also examined whether levels of interracial anxiety change from medical school through residency.

Data Source

Web-based longitudinal survey data from the Medical Student Cognitive Habits and Growth Evaluation Study.

Study Design

We used a retrospective longitudinal design with four observations for each trainee. The study population consisted of non-Black US medical trainees surveyed in their 1st and 4th years of medical school and 2nd and 3rd years of residency. Mixed effects longitudinal models were used to assess predictors of interracial anxiety and assess changes in interracial anxiety scores over time.

Principal Findings

In total, 3155 non-Black medical trainees were followed for 7 years. Seventy-eight percent grew up in predominantly White neighborhoods. Living in predominantly White neighborhoods and having less racially diverse friends were associated with higher levels of interracial anxiety among medical trainees. Trainees' interracial anxiety scores did not substantially change over time; interracial anxiety was highest in the 1st year of medical school, lowest in the 4th year, and increased slightly during residency.

Conclusions

Neighborhood and friend group composition had independent effects on interracial anxiety, indicating that premedical racial socialization may affect medical trainees' preparedness to interact effectively with diverse patient populations. Additionally, the lack of substantial change in interracial anxiety throughout medical training suggests the importance of providing curricular tools and structure (e.g., instituting interracial cooperative learning activities) to foster the development of healthy interracial relationships.  相似文献   
97.
98.
99.
100.
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