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   1991篇
  免费   143篇
  国内免费   5篇
耳鼻咽喉   32篇
儿科学   154篇
妇产科学   121篇
基础医学   223篇
口腔科学   165篇
临床医学   203篇
内科学   433篇
皮肤病学   25篇
神经病学   183篇
特种医学   92篇
外科学   182篇
综合类   21篇
一般理论   2篇
预防医学   92篇
眼科学   38篇
药学   80篇
中国医学   1篇
肿瘤学   92篇
  2023年   25篇
  2022年   27篇
  2021年   67篇
  2020年   46篇
  2019年   84篇
  2018年   85篇
  2017年   52篇
  2016年   64篇
  2015年   65篇
  2014年   89篇
  2013年   110篇
  2012年   153篇
  2011年   135篇
  2010年   75篇
  2009年   79篇
  2008年   125篇
  2007年   108篇
  2006年   114篇
  2005年   98篇
  2004年   99篇
  2003年   65篇
  2002年   61篇
  2001年   16篇
  2000年   25篇
  1999年   24篇
  1998年   6篇
  1997年   5篇
  1996年   6篇
  1995年   5篇
  1994年   8篇
  1993年   4篇
  1992年   17篇
  1991年   22篇
  1990年   15篇
  1989年   16篇
  1988年   13篇
  1987年   15篇
  1986年   17篇
  1985年   14篇
  1984年   18篇
  1983年   5篇
  1982年   5篇
  1981年   6篇
  1980年   4篇
  1977年   4篇
  1974年   6篇
  1973年   4篇
  1969年   3篇
  1967年   3篇
  1965年   3篇
排序方式: 共有2139条查询结果,搜索用时 46 毫秒
1.
Recent years have seen the implementation of educational programs aimed at developing future orientation and better employability skills, mostly for people new to or returning to the job market. In a field study, we investigated the impact of a 5-day program on reintegration to civilian life on young Israeli combat soldiers' time preferences, gratitude, patriotism, and perceptions of their combat experience. Questionnaires administered before and after the program revealed a positive effect on future orientation but a negative effect on gratitude and perceptions of the combat experience. Although the positive effect on future orientation is in line with the program design, the negative effects found should be taken into consideration when planning or improving similar educational programs.  相似文献   
2.
3.
Studies on the exposure of children to sugar-sweetened beverages (SSBs) at an early age may contribute to better understand the common causes and the temporal order of the relationships between obesity and asthma in early childhood. The objective of this study was to estimate the association between SSB and child asthma traits in the 2nd year of life, modeling direct and indirect pathways mediated by the highest BMI-z of the child and allergic inflammation. Data from the BRISA cohort, São Luís-MA, Brazil (n = 1140), were obtained from the baseline and from the follow-up performed at the 2nd year of life. The main explanatory variable was the calories from added sugars in SSBs as a percentage of the total daily energy intake. The outcome child asthma traits was a latent variable deduced from four indicators: medical diagnosis of asthma, wheezing, emergency visit due to intense wheezing, and medical diagnosis of rhinitis. A high percentage of daily calories from sugars added to SSBs was directly associated with higher values of child asthma traits (standardized coefficient (SC = 0.073; P = .030)). High levels of eosinophils were also directly associated with child asthma traits (SC = 0.118; P = .049). No mediation pathways were observed via greater BMI-z or eosinophil counts. Therefore, early exposure of children to SSB may contribute to increased risk of childhood asthma, preceding the link between sugar consumption and overweight/obesity, not yet evident in children in the first 2 years of life.  相似文献   
4.
BackgroundThe diagnostic cascade in the emergency department (ED) has not been fully elucidated.AimTo inspect whether the usage of consulting medicine and imaging contributes to hospital outcomes. We also propose a theoretical model for better understanding the diagnostic cascade of needless medical testing.MethodsA two-level study was conducted. The first local phase was a retrospective archive study that was conducted between 2014 and 2017 in a tertiary hospital. We extracted the number of requested imaging and consultations for each patient, and main time lags were calculated. The second-phase (January–April 2018) was conducted on a national level. We examined 22 hospitals with the emphasis on five hospital outcomes: recurrent ED visits (within 24 h), median waiting time at the ED, rate of early discharge at the same day and day after and percentage of patients spending >4 h in the ED.ResultsA 5% upsurge in CT scans was observed (p = .032), and a significant increase was found in the number of consultations (14%, p = .002). On a national level, a linear regression model found that the proportion of patients discharged from the hospital on the same day and on the day after and the proportion of patients staying in the ED > 4 h predict ED recurrence visits within 24 h (p = .025; R2 = 46.3%).ConclusionsUpsurge in resource usage in the ED leads to a diagnostic cascade of health consumption. Further study is necessary to examine the proposed model in a global scale.  相似文献   
5.
6.
7.
Guidelines recommend cognitive behavioural therapy for insomnia (CBT‐I) as first‐line treatment for chronic insomnia, but it is not clear how many primary care physicians (PCPs) in Switzerland prescribe this treatment. We created a survey that asked PCPs how they would treat chronic insomnia and how much they knew about CBT‐I. The survey included two case vignettes that described patients with chronic insomnia, one with and one without comorbid depression. PCPs also answered general questions about treating chronic insomnia and about CBT‐I and CBT‐I providers. Of the 820 Swiss PCPs we invited, 395 (48%) completed the survey (mean age 54 years; 70% male); 87% of PCPs prescribed sleep hygiene and 65% phytopharmaceuticals for the patient who had only chronic insomnia; 95% prescribed antidepressants for the patient who had comorbid depression. In each case, 20% of PCPs prescribed benzodiazepines or benzodiazepine receptor agonists, 8% prescribed CBT‐I, 68% said they knew little about CBT‐I, and 78% did not know a CBT‐I provider. In the clinical case vignettes, most PCPs treated chronic insomnia with phytopharmaceuticals and sleep hygiene despite their lack of efficacy, but PCPs rarely prescribed CBT‐I, felt they knew little about it, and usually knew no CBT‐I providers. PCPs need more information about the benefits of CBT‐I and local CBT‐I providers and dedicated initiatives to implement CBT‐I in order to reduce the number of patients who are prescribed ineffective or potentially harmful medications.  相似文献   
8.
Rash, a hypersensitivity reaction, is a common cause of withdrawal from an effective antiepileptic drug (AED) in patients with epilepsy. We present a case of successful desensitization to valproic acid in a 12‐year‐old male with childhood absence epilepsy and a hypersensitivity reaction, whose epilepsy did not respond to other AEDs. Desensitization is a practical therapeutic solution for patients who develop a non‐life‐threatening hypersensitivity reaction to an AED for which there may be no substitute.  相似文献   
9.
Although avulsion fractures of the pediatric knee are uncommon, they are important injuries to recognize because they are frequently associated with adjacent soft-tissue and osteocartilaginous abnormalities. Related injuries, which include entrapment of soft-tissue structures, intra-articular fracture extension, and intra-articular loose bodies, can complicate or alter therapy. The most commonly affected soft-tissue structures include the cruciate ligaments, collateral ligaments and supporting tendons, and extensor mechanism and retinacula. The purpose of this pictorial essay is to review avulsion fractures of the pediatric knee and to highlight associated injuries.  相似文献   
10.
Piercing has become so popular during the last 20 to 30 years that many physicians are now treating patients with piercings and dealing with its side effects. We present 3 cases that illustrate the complications of tongue piercing (ie, infection, bleeding, and embedded ornaments). We describe the methods for inserting the ornaments to illustrate the possible adverse effects. Treatment recommendations and their application to those 3 patients are described.  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