全文获取类型
| 收费全文 | 1292139篇 |
| 免费 | 113053篇 |
| 国内免费 | 1680篇 |
专业分类
| 耳鼻咽喉 | 18754篇 |
| 儿科学 | 43918篇 |
| 妇产科学 | 32820篇 |
| 基础医学 | 187622篇 |
| 口腔科学 | 38095篇 |
| 临床医学 | 118642篇 |
| 内科学 | 250071篇 |
| 皮肤病学 | 35088篇 |
| 神经病学 | 106830篇 |
| 特种医学 | 51828篇 |
| 外国民族医学 | 224篇 |
| 外科学 | 198655篇 |
| 综合类 | 22958篇 |
| 现状与发展 | 1篇 |
| 一般理论 | 333篇 |
| 预防医学 | 86544篇 |
| 眼科学 | 29539篇 |
| 药学 | 101546篇 |
| 7篇 | |
| 中国医学 | 4069篇 |
| 肿瘤学 | 79328篇 |
出版年
| 2021年 | 10022篇 |
| 2020年 | 10790篇 |
| 2019年 | 19171篇 |
| 2018年 | 22618篇 |
| 2017年 | 20985篇 |
| 2016年 | 23587篇 |
| 2015年 | 25047篇 |
| 2014年 | 29188篇 |
| 2013年 | 38082篇 |
| 2012年 | 41949篇 |
| 2011年 | 43344篇 |
| 2010年 | 31172篇 |
| 2009年 | 25991篇 |
| 2008年 | 39011篇 |
| 2007年 | 40998篇 |
| 2006年 | 41582篇 |
| 2005年 | 40108篇 |
| 2004年 | 38412篇 |
| 2003年 | 37069篇 |
| 2002年 | 35786篇 |
| 2001年 | 65230篇 |
| 2000年 | 66474篇 |
| 1999年 | 55095篇 |
| 1998年 | 13779篇 |
| 1997年 | 12126篇 |
| 1996年 | 11851篇 |
| 1995年 | 11011篇 |
| 1994年 | 9988篇 |
| 1993年 | 9454篇 |
| 1992年 | 39562篇 |
| 1991年 | 37960篇 |
| 1990年 | 37390篇 |
| 1989年 | 35836篇 |
| 1988年 | 32215篇 |
| 1987年 | 31365篇 |
| 1986年 | 29477篇 |
| 1985年 | 27647篇 |
| 1984年 | 20145篇 |
| 1983年 | 16902篇 |
| 1979年 | 18034篇 |
| 1978年 | 12169篇 |
| 1977年 | 10834篇 |
| 1976年 | 9415篇 |
| 1975年 | 10830篇 |
| 1974年 | 12455篇 |
| 1973年 | 12023篇 |
| 1972年 | 11523篇 |
| 1971年 | 10820篇 |
| 1970年 | 9906篇 |
| 1969年 | 9550篇 |
排序方式： 共有10000条查询结果，搜索用时 0 毫秒
101.
102.
103.
104.
Leandro Viçosa Bonetti Syed A. Hassan Sin-Tung Lau Luana T. Melo Takako Tanaka Kara K. Patterson 《The International journal of neuroscience》2019,129(2):195-203
Purpose of the study: the aim of this study was to synthesize PFC fNIRS outcomes on the effects of cognitive tasks compared to resting/baseline tasks in healthy adults from studies utilizing a pre/post design.
Material and methods: original research studies were searched from seven databases (MEDLINE, EMBASE, CENTRAL, CINAHL, SCOPUS, PEDro and PubMed). Subsequently, two independent reviewers screened the titles and abstracts followed by full-text reviews to assess the studies' eligibility.
Results: eleven studies met the inclusion criteria and had data abstracted and quality assessed. Methodology varied considerably and yet cognitive tasks resulted in the ΔO2Hb increasing in 8 of the 11 and ΔHHb decreasing in 8 of 8 studies that reported this outcome. The cognitive tasks from 10 of the 11 studies were classified as “Working Memory” and “Verbal Fluency Tasks”.
Conclusions: although, the data comparison was challenging provided the heterogeneity in methodology, the results across studies were similar. 相似文献
105.
106.
107.
Stress Testing Versus CT Angiography in Patients With Diabetes and Suspected Coronary Artery Disease
Abhinav Sharma Adrian Coles Nishant K. Sekaran Neha J. Pagidipati Michael T. Lu Daniel B. Mark Kerry L. Lee Hussein R. Al-Khalidi Udo Hoffmann Pamela S. Douglas 《Journal of the American College of Cardiology》2019,73(8):893-902
Background
The optimal noninvasive test (NIT) for patients with diabetes and stable symptoms of coronary artery disease (CAD) is unknown.Objectives
The purpose of this study was to assess whether a diagnostic strategy based on coronary computed tomographic angiography (CTA) is superior to functional stress testing in reducing adverse cardiovascular (CV) outcomes (CV death or myocardial infarction [MI]) among symptomatic patients with diabetes.Methods
PROMISE (Prospective Multicenter Imaging Study for Evaluation of Chest Pain) was a randomized trial evaluating an initial strategy of CTA versus functional testing in stable outpatients with symptoms suggestive of CAD. The study compared CV outcomes in patients with diabetes (n = 1,908 [21%]) and without diabetes (n = 7,058 [79%]) based on their randomization to CTA or functional testing.Results
Patients with diabetes (vs. without) were similar in age (median 61 years vs. 60 years) and sex (female 54% vs. 52%) but had a greater burden of CV comorbidities. Patients with diabetes who underwent CTA had a lower risk of CV death/MI compared with functional stress testing (CTA: 1.1% [10 of 936] vs. stress testing: 2.6% [25 of 972]; adjusted hazard ratio: 0.38; 95% confidence interval: 0.18 to 0.79; p = 0.01). There was no significant difference in nondiabetic patients (CTA: 1.4% [50 of 3,564] vs. stress testing: 1.3% [45 of 3,494]; adjusted hazard ratio: 1.03; 95% confidence interval: 0.69 to 1.54; p = 0.887; interaction term for diabetes p value = 0.02).Conclusions
In diabetic patients presenting with stable chest pain, a CTA strategy resulted in fewer adverse CV outcomes than a functional testing strategy. CTA may be considered as the initial diagnostic strategy in this subgroup. (PROspective Multicenter Imaging Study for Evaluation of Chest Pain [PROMISE]; NCT01174550) 相似文献108.
109.
110.
Micro‐evolution of the hepatitis B virus genome in hepatitis B e‐antigen‐positive carriers: Comparison of genotypes B and C at various immune stages 
下载免费PDF全文
下载免费PDF全文