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   5394篇
  免费   405篇
  国内免费   93篇
耳鼻咽喉   27篇
儿科学   121篇
妇产科学   55篇
基础医学   372篇
口腔科学   112篇
临床医学   857篇
内科学   673篇
皮肤病学   44篇
神经病学   389篇
特种医学   158篇
外科学   339篇
综合类   637篇
一般理论   4篇
预防医学   967篇
眼科学   61篇
药学   589篇
  25篇
中国医学   230篇
肿瘤学   232篇
  2024年   10篇
  2023年   100篇
  2022年   165篇
  2021年   221篇
  2020年   254篇
  2019年   230篇
  2018年   234篇
  2017年   232篇
  2016年   204篇
  2015年   221篇
  2014年   422篇
  2013年   518篇
  2012年   309篇
  2011年   322篇
  2010年   266篇
  2009年   254篇
  2008年   242篇
  2007年   257篇
  2006年   218篇
  2005年   176篇
  2004年   145篇
  2003年   110篇
  2002年   93篇
  2001年   99篇
  2000年   70篇
  1999年   58篇
  1998年   58篇
  1997年   46篇
  1996年   34篇
  1995年   39篇
  1994年   35篇
  1993年   32篇
  1992年   21篇
  1991年   20篇
  1990年   14篇
  1989年   19篇
  1988年   18篇
  1987年   13篇
  1986年   13篇
  1985年   22篇
  1984年   28篇
  1983年   3篇
  1982年   7篇
  1981年   6篇
  1980年   11篇
  1978年   5篇
  1975年   4篇
  1974年   5篇
  1972年   3篇
  1968年   2篇
排序方式: 共有5892条查询结果,搜索用时 15 毫秒
81.
82.
ABSTRACT

This article examines the similarities and differences in the education and training of gerontologists and others who work with older people in Sweden and the United States. It outlines the aging trends in both countries and assesses the level of training for those who provide care in a variety of fields. Both countries are aging, but the programs for gerontological training are quite different in the two countries, reflecting underlying cultural values. Sweden’s education is generally more oriented toward the integration of some aging education in more disciplinary fields, such as nursing and social work and thus could benefit from more specialized, aging-specific courses. The United States is highly specialized, with multiple programs in various subfields of aging (e.g., geropsychology; aging services administration) and could benefit from integrating more aging knowledge into courses in other disciplines. The authors challenge professionals to consider if there is a basic but global curriculum and/or set of competencies in gerontology that could be agreed upon. As an increasingly global village, the ability to share and learn is more easily achievable. Sweden and the United States have much to learn from each other in terms of appropriately educating and training those who support our older people.  相似文献   
83.
84.
Objective: Bronchial thermoplasty (BT) as an add-on therapy for uncontrolled severe asthma is an alternative to biologic therapies like omalizumab (OM). We conducted an indirect treatment comparison (ITC) to appraise comparative effectiveness of BT and OM. Methods: A systematic literature review identified relevant randomized controlled trials. The ITC followed accepted methodology. Results: The ITC comprised a sham-controlled trial of BT (AIR2) and two placebo-controlled trials of OM (INNOVATE; EXTRA). Comparing the BT post-treatment period to ongoing treatment with OM, showed no significant differences in the rate ratios (RRs) for severe exacerbations (RR of BT versus OM = 0.91 [95% CI: 0.64, 1.30]; p = 0.62) or hospitalizations (RR = 0.57 [95% CI: 0.17, 1.86]; p = 0.53); emergency department visits were significantly reduced by 75% with BT (RR = 0.25 [95% CI: 0.07, 0.91]; p = 0.04); the proportions of patients with clinically meaningful response on the asthma quality-of-life questionnaire were comparable (RR = 1.06 [95% CI: 0.86, 1.34]; p = 0.59). The RR for exacerbations statistically favours OM over the total study period in AIR2 (RR = 1.50 [95% CI: 1.11, 2.02]; p = 0.009) likely reflecting a transient increase in events during the BT peri-treatment period. Conclusions: The ITC should be interpreted cautiously considering the differences between patient populations in the included trials. However, based on the analysis, BT compares well with a potentially more costly pharmacotherapy for asthma. Clinicians evaluating the relative merits of using these treatments should consider the totality of evidence and patient preferences to make an informed decision.  相似文献   
85.
BackgroundA leukocyte esterase (LE) test is inexpensive and provides real-time information about patients suspected of periprosthetic joint infections (PJIs). The 2018 International Consensus Meeting (ICM) recommends it as a diagnostic tool with a 2+ cutoff. There is still a lack of data revealing LE utility versus the ICM 2018 criteria for PJI.MethodsThis is a retrospective study of patients who underwent revision total hip and total knee arthroplasty at a single institution between March 2009 and December 2019. All patients underwent joint aspiration before the arthrotomy, and the LE strip test was performed on aspirated joint fluid. PJI was defined using the 2018 ICM criteria.ResultsAs per the 2018 ICM criteria, 78 patients were diagnosed with chronic PJI and 181 were not infected. An LE test with a cutoff of 1+ had a sensitivity of 0.744, a specificity of 0.906, a positive predictive value of 0.773, an accuracy of 0.825 (95% confidence interval 0.772-0.878), and a negative predictive value of 0.891. The positive likelihood ratio (LR+) was 7.917. Using an LE cutoff of 2 + had a sensitivity of 0.513, a specificity of 1.000, and an accuracy of 0.756 (95% confidence interval—0.812).ConclusionLE is a rapid and inexpensive test which can be performed at the bedside. Its performance is valuable as per ICM criteria. Based on the findings of this study and the given cohort, we suggest using the cutoff of LE1+ (result = negative or trace) as a point of care test to exclude infection, whereas LE at 2 + threshold has near absolute specificity for the diagnosis.  相似文献   
86.
87.
88.
89.
Breast cancer is an increasingly urgent problem in low- and mid-level resource countries of the world. Despite knowing the optimal management strategy based on guidelines developed in wealthy countries, clinicians are forced to provide less-than-optimal care to patients when diagnostic and/or treatment resources are lacking. For this reason, it is important to identify which resources commonly applied in resource-abundant countries most effectively fill the healthcare needs in limited-resource regions, where patients commonly present with more advanced disease at diagnosis, and to provide guidance on how new resource allocations should be made in order to maximize improvement in outcome. Established in 2002, the Breast Health Global Initiative (BHGI) created an international health alliance to develop evidence-based guidelines for countries with limited resources (low- and middle-income countries) to improve breast health outcomes. The BHGI serves as a program for international guideline development and as a hub for linkage among clinicians, governmental health agencies and advocacy groups to translate guidelines into policy and practice. The BHGI collaborated with 12 national and international health organizations, cancer societies and nongovernmental organizations to host two BHGI international summits. The evidence-based BHGI Guidelines, developed at the 2002 Global Summit, were published in 2003 as a theoretical treatize on international breast healthcare. These guidelines were then updated and expanded at the 2005 Global Summit into a fully comprehensive and flexible framework to permit incremental improvements in healthcare delivery, based upon outcomes, cost, cost–effectiveness and use of healthcare services.  相似文献   
90.
Children's growing use of the Internet creates both opportunities and risks. Collecting and comparing empirical findings on risks and opportunities experienced across 20 different European countries shows significant differences between them. Using Qualitative Comparative Analysis (QCA), this article investigates which factors contribute towards a high degree of online risk experienced by children across these countries. The research shows that patterns of similarities and differences do not seem to coincide with regional, political, and historical divides across European Union countries. The findings seem to endorse the multilayered approach of multi-stakeholder governance, which stresses the co-responsibility in securing children's online safety. However, one of the most important country conditions explaining high risk appears to be the lack of positive online content provision.  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