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   22164篇
  免费   1895篇
  国内免费   65篇
耳鼻咽喉   125篇
儿科学   879篇
妇产科学   737篇
基础医学   3055篇
口腔科学   359篇
临床医学   3003篇
内科学   3921篇
皮肤病学   296篇
神经病学   2612篇
特种医学   335篇
外科学   1930篇
综合类   331篇
一般理论   46篇
预防医学   2944篇
眼科学   405篇
药学   1527篇
  1篇
中国医学   53篇
肿瘤学   1565篇
  2023年   199篇
  2022年   115篇
  2021年   432篇
  2020年   371篇
  2019年   589篇
  2018年   639篇
  2017年   504篇
  2016年   524篇
  2015年   586篇
  2014年   832篇
  2013年   1190篇
  2012年   1675篇
  2011年   1736篇
  2010年   959篇
  2009年   901篇
  2008年   1439篇
  2007年   1557篇
  2006年   1528篇
  2005年   1442篇
  2004年   1404篇
  2003年   1268篇
  2002年   1188篇
  2001年   192篇
  2000年   146篇
  1999年   159篇
  1998年   199篇
  1997年   166篇
  1996年   138篇
  1995年   146篇
  1994年   115篇
  1993年   133篇
  1992年   87篇
  1991年   80篇
  1990年   69篇
  1989年   71篇
  1988年   59篇
  1987年   56篇
  1986年   53篇
  1985年   52篇
  1984年   51篇
  1983年   71篇
  1982年   73篇
  1981年   62篇
  1980年   69篇
  1979年   46篇
  1978年   45篇
  1977年   40篇
  1976年   46篇
  1974年   44篇
  1973年   43篇
排序方式: 共有10000条查询结果,搜索用时 203 毫秒
1.
2.
3.
4.

Objectives

We examined the association between three inflammatory markers (Interleukin (IL)-6, C-reactive protein (CRP), tumor necrosis factor (TNF)-α) and incident lung cancer using baseline, updated, and averaged inflammatory measures in older adults.

Methods

We fitted multivariable Cox models to assess whether circulating levels of inflammation markers were associated with incident lung cancers in the Health Aging, Body and Composition (HealthABC) prospective cohort of 3075 older adults aged 70–79?years at baseline. IL-6 and CRP were measured biennially, whereas TNF-α was measured at baseline.

Results

Baseline levels of IL-6 were significantly associated with incident lung cancer risk in a model that adjusted for age, gender, race, and site (Model 1) (Hazard RatioT3 vs. T1: 3.34, 95% Confidence Interval: 1.91, 5.85) and in a model adjusted for health factors linked to chronic inflammation (Model 2) (HR T3 vs. T1: 2.57, 95% CI: 1.41, 4.65). The associations observed in time-updated IL-6 (HR T3 vs. T1: 2.47, 95% CI: 1.43, 4.28), cumulatively averaged IL-6 (HR T3 vs. T1: 2.47, 95% CI: 1.43, 4.35), and baseline CRP levels (HR T3 vs. T1: 1.85, 95% CI: 1.11, 3.08) with incident lung cancer in Model 1 were not statistically significant in Model 2.

Conclusions

Baseline CRP and IL-6 levels were associated with increased risk of lung cancer in Model 1 and both models, respectively. Chronic IL-6 inflammation, as quantified by repeated measures was associated with incident lung cancer in Model 1, but not Model 2. Further research is needed to understand the role of CRP and IL-6 in lung carcinogenesis.  相似文献   
5.
Purpose: Competency-based medical education (CBME) seeks to prepare undergraduate and postgraduate trainees for clinical practice. Its major emphasis is on outcomes, but questions about how best to reach these remain. One key issue is the need to integrate what matters most to students when setting educational goals: this is crucial if we are to design curricula that trainees understand and engage with, and that promote successful achievement of competencies.

Method: We interviewed medical students in years 4 and 6 of a 6-year medical degree and used thematic analysis to understand their main educational priorities and how these fit with the aims of CBME.

Results: Two major themes emerged: features of content and process. For content, students wanted clear guidance on what constitutes competence, finding broad outcome statements abstract and difficult to understand as novices. They also attach critical importance to features of process such as being welcomed, included in clinical teams and being known personally – these promote motivation, understanding, and professional development.

Conclusions: We present recommendations for those designing CBME curricula to emphasize the student perspective: what kind of guidance on outcomes is required, and features of process that must not be neglected if competence is to be achieved.  相似文献   

6.
7.
The ligament of the head of femur (LHF) has gained clinical attention recently and is reported to contribute to hip stability. This study explores its morphology and morphometry, information that may help inform surgical decision making. Gross anatomical dissections were undertaken on 229 embalmed hips from European (n = 105) and Thai (n = 124) adult cadavers to examine LHF anatomy. Ligament morphometry was statistically compared at different sites, between sexes and sides. The origin of ligamental arteries and absence of the ligament were documented. The LHF was pyramidal or quadrangular in shape. Sub‐synovial fibrous bands originated from the transverse acetabular ligament, edges of the acetabular notch, and acetabular floor; less frequently from the hip joint capsule. Distally, the ligament flattened and converged onto the fovea capitis. The ligament was 22.3 ± 4.4 mm long and was significantly wider (P = 0.001) and thicker (P = 0.0003) at the fovea, compared to its mid‐zone. Branches of the obturator artery entered the acetabular foramen inferomedially and penetrated the middle third of the LHF. Blood vessels ran within the LHF and appeared to enter the fovea. The ligament was absent in 2.8% of Thai hips and there were no significant sex or side differences in ligament dimensions. The morphology of the LHF is complex. While individual variation was apparent, blood vessels were seen in the distal ligament. Precise information on LHF morphometry and attachment sites will help inform appropriate graft dimensions and choice of fixation sites necessary for ligament reconstruction. Clin. Anat., 2018. © 2018 Wiley Periodicals, Inc. Clin. Anat., 2018. © 2018 Wiley Periodicals, Inc.  相似文献   
8.
Objectives: To examine the relative importance of different home support attributes from the perspective of carers of people with later-stage dementia.

Method: Preferences from 100 carers, recruited through carers’ organisations, were assessed with a Discrete Choice Experiment (DCE) survey, administered online and by paper questionnaire. Attributes were informed by an evidence synthesis and lay consultations. A conditional logit model was used to estimate preference weights for the attributes within a home support ‘package’.

Results: The most preferred attributes were ‘respite care, available regularly to fit your needs’ (coefficient 1.29, p = < 0.001) and ‘home care provided regularly for as long as needed’ (coefficient 0.93, p = < 0.001). Cost had a significant effect with lower cost packages preferred. Findings were similar regardless of the method of administration, with respite care considered to be the most important attribute for all carers. Carers reported that completing the DCE had been a positive experience; however, feedback was mixed overall.

Conclusions: These carer preferences concur with emerging evidence on home support interventions for dementia. Respite care, home care and training on managing difficulties provided at home are important components. Carers’ preferences revealed the daily challenges of caring for individuals with later stage dementia and the need for tailored and specialised home support.  相似文献   

9.
ABSTRACT

Introduction: Individuals with Autism Spectrum Disorder display a pattern of social communication deficits and restricted and repetitive behaviors that leave them particularly vulnerable to developing anxiety. The presence of a co-occurring Intellectual Disability further complicates the situation, compromising traditional diagnostic techniques and processes. The dual diagnosis of ASD and ID appears to result in specific behavioral patterns that affect the way anxiety is identified in this population.

Method: A scoping review was undertaken to explore what is currently known about the way anxiety is identified and diagnosed in individuals with ASD and ID.

Results: In the limited research available consistent themes of difficulties with the diagnostic process, inconsistencies among measurement tools and the need to consider behavioral symptomology were found.

Conclusion: Further research needs to be conducted to enhance our understanding of how anxiety is identified in those with ASD and ID. This research could more accurately inform reliable diagnostic processes and lead to better treatment and outcomes for this population.  相似文献   
10.

Early childhood disruptive behaviors are common mental health problems among American youth, and if poorly-managed, pose costly psychological and societal burdens. Outcomes accountability systems in clinical practice are vital opportunities to optimize early intervention for common mental health problems; however, such systems seem rare. A scoping review was conducted to summarize the current availability of outcomes accountability systems in clinical programs addressing early childhood disruptive behaviors, particularly in the US. We used PsycINFO to identify peer-reviewed literature published in English from 2005 to 2021, from which we selected 23 publications from the US, UK, and Netherlands on outcomes accountability systems within clinical programs treating common childhood mental health problems. Only 3 out of 23 publications described outcomes accountability efforts specifically for early childhood problems. Within the 3 studies, only one UK-based study specifically targeted early childhood disruptive behaviors. We did not find publications specifically describing outcomes accountability efforts in US-based clinical programs to treat early childhood disruptive behaviors. There are multi-level challenges preventing changes to the prevalent US model of paying a fee for each unit of child mental healthcare, with little regard for patient outcomes. However, opportunities exist to improve US-based accountability efforts; from top-down expansion of financial incentives, accountability initiatives, and PDT evidence-based practices to an iterative, bottom-up development of meaningful outcomes measurement by providers. Greater adoption of outcomes monitoring in US clinical practice for common mental health problems can optimize management of early childhood disruptive behaviors and mitigate long-term societal and economic burdens.

  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