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   2202篇
  免费   137篇
  国内免费   3篇
耳鼻咽喉   39篇
儿科学   208篇
妇产科学   77篇
基础医学   276篇
口腔科学   40篇
临床医学   112篇
内科学   389篇
皮肤病学   26篇
神经病学   197篇
特种医学   37篇
外科学   379篇
综合类   49篇
现状与发展   1篇
一般理论   1篇
预防医学   78篇
眼科学   48篇
药学   175篇
中国医学   6篇
肿瘤学   204篇
  2023年   17篇
  2022年   12篇
  2021年   62篇
  2020年   35篇
  2019年   52篇
  2018年   61篇
  2017年   46篇
  2016年   51篇
  2015年   60篇
  2014年   58篇
  2013年   91篇
  2012年   125篇
  2011年   146篇
  2010年   92篇
  2009年   83篇
  2008年   121篇
  2007年   133篇
  2006年   108篇
  2005年   124篇
  2004年   85篇
  2003年   85篇
  2002年   69篇
  2001年   54篇
  2000年   51篇
  1999年   46篇
  1998年   17篇
  1997年   20篇
  1996年   11篇
  1995年   11篇
  1992年   31篇
  1991年   29篇
  1990年   24篇
  1989年   18篇
  1988年   28篇
  1987年   16篇
  1986年   13篇
  1985年   17篇
  1984年   12篇
  1983年   16篇
  1982年   14篇
  1981年   10篇
  1979年   10篇
  1978年   19篇
  1977年   21篇
  1976年   12篇
  1975年   11篇
  1974年   20篇
  1973年   14篇
  1972年   15篇
  1970年   12篇
排序方式: 共有2342条查询结果,搜索用时 15 毫秒
1.
2.
3.
4.
5.
6.
7.
Competency-based assessments (CBAs) have gained traction in graduate medical education and inform important learner outcomes through the continuum of medical training. Active participation in new CBAs presents challenges to faculty working in a busy clinical environment. As such, the implementation of new CBAs can be approached with intention to foster acceptance and engagement with new evaluations. This paper describes strategies utilized to implement CBAs among clinician educators during a national assessment pilot. Our methods are grounded in educational, psychological, business, ecological, communication, and information technology theory. Our primary interventions included creating a multilevel vision, engaging a dedicated work group, incorporating quality improvement methodology, and integrating technology to successfully implement the assessments. These practical and effective interventions may also be applied to the implementation of other educational innovations.  相似文献   
8.
IntroductionUnderstanding how different countries have responded to mitigate the risk of severe acute respiratory syndrome coronavirus 2 (SARS CoV-2) transmission in dental offices is important. This article describes the different approaches taken towards optimal fallow periods in Canadian jurisdictions.MethodsWe searched publicly available information from dentist and dental hygiene regulator websites across the 10 provinces and 3 territories in Canada. We also searched for guidance documents on dental associations’ websites or through personal communication with government officials. We extracted and tabulated information on fallow period recommendations or guidance, when available.ResultsNine jurisdictions (6 provinces and all 3 territories) acknowledge or provide guidance on fallow periods following aerosol-generating procedures. Among those who have provided guidance regarding a fallow period, recommendations follow the Centers for Disease Control and Prevention guidance if the air changes per hour (ACH) in the dental operatory is known.ConclusionThe evidence for deciding on optimal fallow period is limited and still being explored, resulting in substantial variation across Canadian jurisdictions. A focus on developing scientific evidence relevant to dentistry and assimilating existing science is crucial to establishing consistency and uniformity in information to deliver safe oral health care services.  相似文献   
9.
AIM: To evaluate the impact of reporting bowel preparation using Boston Bowel Preparation Scale(BBPS) in clinical practice.METHODS: The study was a prospective observational cohort study which enrolled subjects reporting for screening colonoscopy. All subjects received a gallon of polyethylene glycol as bowel preparation regimen. After colonoscopy the endoscopists determined quality of bowel preparation using BBPS. Segmental scores were combined to calculate composite BBPS. Site and size of the polyps detected was recorded. Pathology reports were reviewed to determine advanced adenoma detection rates(AADR). Segmental AADR's were calculated and categorized based on the segmental BBPS to determine the differential impact of bowel prep on AADR. RESULTS: Three hundred and sixty subjects were enrolled in the study with a mean age of 59.2 years, 36.3% males and 63.8% females. Four subjects with incomplete colonoscopy due BBPS of 0 in any segment were excluded. Based on composite BBPS subjects were divided into 3 groups; Group-0(poor bowel prep, BBPS 0-3) n = 26(7.3%), Group-1(Suboptimal bowel prep, BBPS 4-6) n = 121(34%) and Group-2(Adequate bowel prep, BBPS 7-9) n = 209(58.7%). AADR showed a linear trend through Group-1 to 3; with an AADR of 3.8%, 14.8% and 16.7% respectively. Also seen was a linear increasing trend in segmental AADR with improvement in segmental BBPS. There was statistical significant difference between AADR among Group 0 and 2(3.8% vs 16.7%, P 0.05), Group 1 and 2(14.8% vs 16.7%, P 0.05) and Group 0 and 1(3.8% vs 14.8%, P 0.05). χ2 method was used to compute P value for determining statistical significance.CONCLUSION: Segmental AADRs correlate with segmental BBPS. It is thus valuable to report segmental BBPS in colonoscopy reports in clinical practice.  相似文献   
10.
Oligoamenorrheic athletes (OAs) have lower bone mineral density (BMD) and greater impairment of bone microarchitecture, and therefore higher fracture rates compared to eumenorrheic athletes. Although improvements in areal BMD (aBMD; measured by dual-energy X-ray absorptiometry) in OAs have been demonstrated with transdermal estrogen treatment, effects of such treatment on bone microarchitecture are unknown. Here we explore effects of transdermal versus oral estrogen versus no estrogen on bone microarchitecture in OA. Seventy-five OAs (ages 14 to 25 years) were randomized to (i) a 100-μg 17β-estradiol transdermal patch (PATCH) administered continuously with 200 mg cyclic oral micronized progesterone; (ii) a combined 30 μg ethinyl estradiol and 0.15 mg desogestrel pill (PILL); or (iii) no estrogen/progesterone (NONE) and were followed for 12 months. Calcium (≥1200 mg) and vitamin D (800 IU) supplements were provided to all. Bone microarchitecture was assessed using high-resolution peripheral quantitative CT at the distal tibia and radius at baseline and 1 year. At baseline, randomization groups did not differ by age, body mass index, percent body fat, duration of amenorrhea, vitamin D levels, BMD, or bone microarchitecture measurements. After 1 year of treatment, at the distal tibia there were significantly greater increases in total and trabecular volumetric BMD (vBMD), cortical area and thickness, and trabecular number in the PATCH versus PILL groups. Trabecular area decreased significantly in the PATCH group versus the PILL and NONE groups. Less robust differences between groups were seen at the distal radius, where percent change in cortical area and thickness was significantly greater in the PATCH versus PILL and NONE groups, and changes in cortical vBMD were significantly greater in the PATCH versus PILL groups. In conclusion, in young OAs, bone structural parameters show greater improvement after 1 year of treatment with transdermal 17β-estradiol versus ethinyl estradiol–containing pills, particularly at the tibia. © 2019 American Society for Bone and Mineral Research.  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