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   168131篇
  免费   33654篇
  国内免费   2481篇
耳鼻咽喉   5361篇
儿科学   5848篇
妇产科学   2787篇
基础医学   6172篇
口腔科学   1984篇
临床医学   28488篇
内科学   51266篇
皮肤病学   7885篇
神经病学   16944篇
特种医学   6891篇
外科学   42380篇
综合类   336篇
现状与发展   72篇
一般理论   13篇
预防医学   8700篇
眼科学   3725篇
药学   2171篇
中国医学   84篇
肿瘤学   13159篇
  2024年   535篇
  2023年   4934篇
  2022年   1482篇
  2021年   3699篇
  2020年   6419篇
  2019年   2754篇
  2018年   7986篇
  2017年   7789篇
  2016年   8947篇
  2015年   9057篇
  2014年   16234篇
  2013年   16569篇
  2012年   7068篇
  2011年   7187篇
  2010年   11217篇
  2009年   15025篇
  2008年   7109篇
  2007年   5338篇
  2006年   7735篇
  2005年   4935篇
  2004年   4113篇
  2003年   2978篇
  2002年   2907篇
  2001年   3876篇
  2000年   3059篇
  1999年   3297篇
  1998年   3796篇
  1997年   3597篇
  1996年   3456篇
  1995年   3286篇
  1994年   2001篇
  1993年   1603篇
  1992年   1400篇
  1991年   1421篇
  1990年   1082篇
  1989年   1192篇
  1988年   1025篇
  1987年   863篇
  1986年   890篇
  1985年   722篇
  1984年   556篇
  1983年   532篇
  1982年   521篇
  1981年   407篇
  1980年   373篇
  1979年   315篇
  1978年   335篇
  1977年   404篇
  1975年   283篇
  1972年   307篇
排序方式: 共有10000条查询结果,搜索用时 478 毫秒
81.
82.
83.

Background

Physicians treating nonvalvular atrial fibrillation (AF) assess stroke and bleeding risks when deciding on anticoagulation. The agreement between empirical and physician-estimated risks is unclear. Furthermore, the association between patient and physician sex and anticoagulation decision-making is uncertain.

Methods

We pooled data from 2 national primary care physician chart audit databases of patients with AF (Facilitating Review and Education to Optimize Stroke Prevention in Atrial Fibrillation and Coordinated National Network to Engage Physicians in the Care and Treatment of Patients with Atrial Fibrillation Chart Audit) with a combined 1035 physicians (133 female, 902 male) and 10,927 patients (4567 female and 6360 male).

Results

Male physicians underestimated stroke risk in female patients and overestimated risk in male patients. Female physicians estimated stroke risk well in female patients but underestimated the risk in male patients. Risk of bleeding was underestimated in all. Despite differences in risk assessment by physician and patient sex, > 90% of patients received anticoagulation across all subgroups. There was modest agreement between physician estimated and calculated (ie, CHADS2 score) stroke risk: Kappa scores were 0.41 (0.35-0.47) for female physicians and 0.34 (0.32-0.36) for male physicians.

Conclusions

Our study is the first to examine the association between patient and physician sex influences and stroke and bleeding risk estimation in AF. Although there were differences in agreement between physician estimated stroke risk and calculated CHADS2 scores, these differences were small and unlikely to affect clinical practice; further, despite any perceived differences in the accuracy of risk assessment by sex, most patients received anticoagulation.  相似文献   
84.
85.
86.
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   
87.
Marielle Kabbouche MD  FAHS 《Headache》2015,55(10):1426-1429
Status migrainosus is defined by the international classification of headache disorders (ICHD) criteria as a debilitating migraine lasting more then 72 hours. The epidemiology of status migrainosus is still unknown in adult and children, and frequently underdiagnosed. Children and adolescents often end up in the emergency room with an intractable headache that failed outpatient therapy. Six to seven percent of these children do not respond to acute infusion therapy and require hospitalization. It is imperative that more aggressive therapy is considered when patients are affected by a severe intractable headache to prevent further disability and returning the child to baseline activity. Multiple therapies are available for adults and children. Studies for acute therapy in the emergency room are available in adults and pediatric groups. Small studies are available for inpatient therapy in children and, along with available therapies for children and adolescents, are described in this review. A review of the literature shows growing evidence regarding the use of dihydroergotamine intravenously once patients are hospitalized. Effectiveness and safety have been proven in the last decades in adults and small studies in the pediatric populations.  相似文献   
88.
89.
90.
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