全文获取类型
收费全文 | 114371篇 |
免费 | 9363篇 |
国内免费 | 511篇 |
专业分类
耳鼻咽喉 | 361篇 |
儿科学 | 3666篇 |
妇产科学 | 2545篇 |
基础医学 | 5566篇 |
口腔科学 | 2264篇 |
临床医学 | 29149篇 |
内科学 | 14114篇 |
皮肤病学 | 946篇 |
神经病学 | 4444篇 |
特种医学 | 1013篇 |
外国民族医学 | 2篇 |
外科学 | 8011篇 |
综合类 | 9422篇 |
现状与发展 | 1篇 |
一般理论 | 70篇 |
预防医学 | 30416篇 |
眼科学 | 469篇 |
药学 | 7074篇 |
135篇 | |
中国医学 | 1248篇 |
肿瘤学 | 3329篇 |
出版年
2024年 | 218篇 |
2023年 | 3282篇 |
2022年 | 4213篇 |
2021年 | 6160篇 |
2020年 | 6317篇 |
2019年 | 7121篇 |
2018年 | 6490篇 |
2017年 | 5180篇 |
2016年 | 4337篇 |
2015年 | 4385篇 |
2014年 | 8680篇 |
2013年 | 9261篇 |
2012年 | 6801篇 |
2011年 | 7088篇 |
2010年 | 5357篇 |
2009年 | 5241篇 |
2008年 | 4935篇 |
2007年 | 4902篇 |
2006年 | 3986篇 |
2005年 | 3109篇 |
2004年 | 2559篇 |
2003年 | 2033篇 |
2002年 | 1551篇 |
2001年 | 1370篇 |
2000年 | 1191篇 |
1999年 | 1041篇 |
1998年 | 840篇 |
1997年 | 660篇 |
1996年 | 539篇 |
1995年 | 413篇 |
1994年 | 376篇 |
1993年 | 343篇 |
1992年 | 251篇 |
1991年 | 222篇 |
1990年 | 175篇 |
1989年 | 139篇 |
1988年 | 115篇 |
1987年 | 111篇 |
1985年 | 345篇 |
1984年 | 433篇 |
1983年 | 343篇 |
1982年 | 350篇 |
1981年 | 331篇 |
1980年 | 271篇 |
1979年 | 250篇 |
1978年 | 214篇 |
1977年 | 162篇 |
1976年 | 145篇 |
1975年 | 126篇 |
1974年 | 104篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
21.
Anne-Sophie Worm Fenger Markus Harboe Olsen Maria Louise Fabritius Christian Gunge Riberholt Kirsten Møller 《Acta anaesthesiologica Scandinavica》2023,67(2):240-247
Background
Hyperglycaemia is common in patients with acute brain injury admitted to an intensive care unit (ICU). Many studies have found associations between development of hyperglycaemia and increased mortality in hospitalised patients. However, the optimal target for blood glucose control is unknown. We want to conduct a systematic review with meta-analysis and trial sequential analysis to explore the beneficial and harmful effects of restrictive versus liberal glucose control on patient outcomes in adults with severe acute brain injury.Methods
We will systematically search medical databases including CENTRAL, Embase, MEDLINE and trial registries. We will search the following websites for ongoing or unpublished trials: http://www.controlled-trials.com/ , http://www.clinicaltrials.gov/ , www.eudraCT.com , http://centerwatch.com/ , The Cochrane Library's CENTRAL, PubMed, EMBASE, Science Citation Index Expanded and CINAHL. Two authors will independently review and select trials and extract data. We will include randomised trials comparing levels of glucose control in our analyses and observational studies will be included to address potential harms. The primary outcomes are defined as all-cause mortality, functional outcome and health-related quality of life. Secondary outcomes include serious adverse events including hypoglycaemia, length of ICU stay and duration of mechanical ventilation, and explorative outcomes including intracranial pressure and infection. Trial Sequential Analysis will be used to investigate the risk of type I error due to repetitive testing and to further explore imprecision. Quality of trials will be evaluated using the Cochrane Risk of Bias tool, and quality of evidence will be assessed using the Grading of Recommendations, Assessment, Development and Evaluations (GRADE) approach.Discussion
The results of the systematic review will be disseminated through peer-reviewed publication. With the review, we hope to inform future randomised clinical trials and improve clinical practice. 相似文献22.
《Bulletin du cancer》2023,110(2):145-150
23.
24.
《Research in social & administrative pharmacy》2022,18(9):3694-3698
In this paper, we argue that understanding and addressing the problem of poor-quality medical products requires a more interdisciplinary approach than has been evident to date. While prospective studies based on rigorous standardized methodologies are the gold standard for measuring the prevalence of poor-quality medical products and understanding their distribution nationally and internationally, they should be complemented by social science research to unpack the complex set of social, economic, and governance factors that underlie these patterns. In the following sections, we discuss specific examples of prospective quality surveys and of social science studies, highlighting the value of cross-sector partnerships in driving high-quality, policy-relevant research in this area. 相似文献
25.
26.
27.
《Gait & posture》2020
BackgroundUsing a mobile phone while performing a postural and locomotor tasks is a common, daily situation. Conversing or sending messages (SMS) while walking account for a significant share of accidental injuries. Therefore, understanding the consequences of using a mobile phone on balance and walking is important, all the more so when these postural and locomotor tasks are aggravated by a disease.Research questionOur objective was to conduct a scoping review on the influence of a dual-task situation – generated by the use of mobile phone – on users' postural and/or locomotor tasks.MethodsThe literature search was conducted in English on PubMed/Medline and CINHAL databases, using keywords associated with postural and locomotor tasks and with the use of mobile phone. Study location, population, number of subjects, experimental design, types of phone use, evaluated postural-locomotor tasks and expected effects were then analyzed.Results and significance46 studies were included in this work, 24 of which came from North America. All studies compared postural and locomotor tasks with and without the use of a smartphone. Ten studies also compared at least 2 groups with different characteristics. Only 4 studies included pathological subjects. Various modalities were tested, and most studies focused on walking. Results show that the use of smartphones slows down movement and induces a systematic imbalance, except when listening to music. The dual task of "using the smartphone during a postural or locomotor tasks" induces systematic disturbances of balance and movement, which must be taken into account in the rehabilitation approach. Future studies will have to extend the knowledge regarding pathological situations. 相似文献
28.
Daniel Schar Pawin Padungtod Nguyen Tung Michael OLeary Wantanee Kalpravidh Filip Claes 《Influenza and other respiratory viruses》2019,13(6):618-621
Among the chief limitations in achieving early detection and control of animal‐origin influenza of pandemic potential in high‐risk livestock populations is the existing lag time between sample collection and diagnostic result. Advances in molecular diagnostics are permitting deployment of affordable, rapid, highly sensitive, and specific point‐of‐capture assays, providing opportunities for targeted surveillance driving containment strategies with potentially compelling returns on investment. Interrupting disease transmission at source holds promise of disrupting cycles of animal‐origin influenza incursion to endemicity and limiting impact on animal production, food security, and public health. Adoption of new point‐of‐capture diagnostics should be undertaken in the context of promoting robust veterinary services systems and parallel support for operationalizing pre‐authorized plans and communication strategies that will ensure that the full potential of these new platforms is realized. 相似文献
29.
30.