全文获取类型
收费全文 | 2806篇 |
免费 | 353篇 |
国内免费 | 10篇 |
专业分类
耳鼻咽喉 | 19篇 |
儿科学 | 170篇 |
妇产科学 | 145篇 |
基础医学 | 351篇 |
口腔科学 | 45篇 |
临床医学 | 294篇 |
内科学 | 493篇 |
皮肤病学 | 158篇 |
神经病学 | 128篇 |
特种医学 | 191篇 |
外科学 | 377篇 |
综合类 | 59篇 |
预防医学 | 335篇 |
眼科学 | 96篇 |
药学 | 118篇 |
中国医学 | 5篇 |
肿瘤学 | 185篇 |
出版年
2021年 | 39篇 |
2020年 | 18篇 |
2019年 | 37篇 |
2018年 | 79篇 |
2017年 | 63篇 |
2016年 | 72篇 |
2015年 | 58篇 |
2014年 | 79篇 |
2013年 | 124篇 |
2012年 | 106篇 |
2011年 | 99篇 |
2010年 | 115篇 |
2009年 | 90篇 |
2008年 | 117篇 |
2007年 | 122篇 |
2006年 | 113篇 |
2005年 | 95篇 |
2004年 | 90篇 |
2003年 | 63篇 |
2002年 | 90篇 |
2001年 | 72篇 |
2000年 | 69篇 |
1999年 | 51篇 |
1998年 | 83篇 |
1997年 | 68篇 |
1996年 | 77篇 |
1995年 | 73篇 |
1994年 | 50篇 |
1993年 | 59篇 |
1992年 | 84篇 |
1991年 | 65篇 |
1990年 | 66篇 |
1989年 | 46篇 |
1988年 | 56篇 |
1987年 | 61篇 |
1986年 | 53篇 |
1985年 | 42篇 |
1984年 | 42篇 |
1983年 | 50篇 |
1982年 | 25篇 |
1981年 | 31篇 |
1980年 | 21篇 |
1979年 | 28篇 |
1978年 | 23篇 |
1977年 | 30篇 |
1976年 | 18篇 |
1975年 | 17篇 |
1974年 | 14篇 |
1973年 | 18篇 |
1972年 | 12篇 |
排序方式: 共有3169条查询结果,搜索用时 16 毫秒
1.
We aimed to safely introduce dexmedetomidine into a nurse-led sedation service for magnetic resonance imaging in children. Secondary aims were to increase the number of children eligible for sedation and to increase the actual number of children having sedation performed by our nurse sedation team. We analysed 1768 consecutive intravenous and 219 intranasal dexmedetomidine sedation episodes in infants, children and adolescents having magnetic resonance imaging scans between March 2016 and March 2022. The overall sedation success rate was 98.4%, with a 98.9% success rate for intravenous dexmedetomidine and a 95.0% success rate for intranasal dexmedetomidine. The incidence of scan interruption during intravenous and intranasal dexmedetomidine sedation was 8.8% and 21.9%, respectively. We conclude that paediatric sedation with dexmedetomidine for magnetic resonance scanning is safe and successful. 相似文献
2.
3.
4.
Keumseok Koh Todd E. Elder Sue C. Grady Joe T. Darden Igor Vojnovic 《Ethnicity & health》2020,25(5):665-678
ABSTRACT Objective: There are substantial racial and regional disparities in obesity prevalence in the United States. This study partitioned the mean Body Mass Index (BMI) and obesity prevalence rate gaps between non-Hispanic blacks and non-Hispanic whites into the portion attributable to observable obesity risk factors and the remaining portion attributable to unobservable factors at the national and the state levels in the United States (U.S.) in 2010. Design: This study used a simulated micro-population dataset combining common information from the Behavioral Risk Factor Surveillance System and the U.S. Census data to obtain a reliable, large sample representing the adult populations at the national and state levels. It then applied a reweighting decomposition method to decompose the black-white mean BMI and obesity prevalence disparities at the national and state levels into the portion attributable to the differences in distribution of observable obesity risk factors and the remaining portion unexplainable with risk factors. Results: We found that the observable differences in distribution of known obesity risk factors explain 18.5% of the mean BMI difference and 20.6% of obesity prevalence disparities between non-Hispanic blacks and non-Hispanic whites. There were substantial variations in how much the differences in distribution of known obesity risk factors can explain black-white gaps in mean BMI (?67.7% to 833.6%) and obesity prevalence (?278.5% to 340.3%) at the state level. Conclusion: The results from this study demonstrate that known obesity risk factors explain a small proportion of the racial, ethnic and between-state disparities in obesity prevalence in the United States. Future etiologic studies are required to further understand the causal factors underlying obesity and racial, ethnic and geographic disparities. 相似文献
5.
6.
7.
8.
9.
10.