收费全文 | 10066篇 |
免费 | 552篇 |
国内免费 | 33篇 |
耳鼻咽喉 | 165篇 |
儿科学 | 197篇 |
妇产科学 | 302篇 |
基础医学 | 1627篇 |
口腔科学 | 1145篇 |
临床医学 | 658篇 |
内科学 | 2018篇 |
皮肤病学 | 240篇 |
神经病学 | 820篇 |
特种医学 | 156篇 |
外科学 | 1220篇 |
综合类 | 43篇 |
一般理论 | 10篇 |
预防医学 | 844篇 |
眼科学 | 244篇 |
药学 | 584篇 |
中国医学 | 43篇 |
肿瘤学 | 335篇 |
2023年 | 74篇 |
2022年 | 72篇 |
2021年 | 273篇 |
2020年 | 215篇 |
2019年 | 256篇 |
2018年 | 341篇 |
2017年 | 220篇 |
2016年 | 276篇 |
2015年 | 298篇 |
2014年 | 403篇 |
2013年 | 541篇 |
2012年 | 816篇 |
2011年 | 903篇 |
2010年 | 461篇 |
2009年 | 426篇 |
2008年 | 684篇 |
2007年 | 688篇 |
2006年 | 560篇 |
2005年 | 488篇 |
2004年 | 445篇 |
2003年 | 379篇 |
2002年 | 352篇 |
2001年 | 209篇 |
2000年 | 174篇 |
1999年 | 135篇 |
1998年 | 39篇 |
1997年 | 30篇 |
1996年 | 30篇 |
1995年 | 25篇 |
1994年 | 30篇 |
1993年 | 23篇 |
1992年 | 55篇 |
1991年 | 52篇 |
1990年 | 46篇 |
1989年 | 33篇 |
1988年 | 47篇 |
1987年 | 37篇 |
1986年 | 41篇 |
1985年 | 46篇 |
1984年 | 22篇 |
1983年 | 31篇 |
1982年 | 21篇 |
1981年 | 21篇 |
1979年 | 24篇 |
1975年 | 23篇 |
1974年 | 17篇 |
1972年 | 18篇 |
1971年 | 23篇 |
1970年 | 33篇 |
1969年 | 19篇 |
Objective
Assess the impact of a web-based gamification program on nutrition literacy of families and explore differences in impact by socioeconomic status.Design
Quasi-experimental.Setting
Thirty-seven kindergartens from Portugal.Participants
Eight hundred seventy-seven families.Intervention
Web-based social network of participants' interactions, educational materials, apps and nutritional challenges, focused on fruit, vegetables, sugar, and salt.Main Outcome Measures
Parental nutrition literacy (self-reported survey – 4 dimensions: Nutrients, Food portions, Portuguese food wheel groups, Food labeling).Analysis
General linear model – Repeated measures was used to analyze the effect on the nutrition literacy score.Results
Families uploaded 1267 items (recipes, photographs of challenges) and educators uploaded 327 items (photographs, videos) onto the interactive platform. For the intervention group (n?=?106), the final mean (SD) score of nutrition literacy was significantly higher than the baseline: 78.8% (15.6) vs 72.7% (16.2); P < .001, regardless of parental education and perceived income status. No significant differences in the scores of the control group (n?=?83) were observed (final 67.8% [16.1] vs initial 66.4% [15.6]; P?=?.364).Conclusions and Implications
Gamified digital interactive platform seems to be a useful, easily adapted educational tool for the healthy eating learning process. Future implementations of the program will benefit from longer time intervention and assessment of the eating habits of families before and after intervention. 相似文献Aims: This narrative review aimed to evaluate existing standardised language tests used in the assessment of PPA, in order to determine whether they are appropriate and psychometrically adequate to detect change over time in the treatment of anomia.
Main Contribution: The present findings highlight the scarcity of psychometrically robust instruments used to measure therapy-induced gains in PPA. Additionally, most of these instruments were not validated for use with the PPA population, which consequently might bias the results. There is a need for population-based norms for existing instruments.
Conclusions: The accurate assessment of lexico-semantic deficits in PPA should rely on objective, reliable, valid, and responsive outcome measures. Psychometric studies are needed to evaluate and eventually improve the quality of language tests used in clinical practice. 相似文献
- The increase in ischemic heart disease mortality rates is related to geographical disparities.
- The IHD mortality is differentially associated to socioeconomic factors, exam coverage, and access to health.
- Higher accessibility to chemical reperfusion centers did not necessarily improve patient outcomes in some regions of the state.
- Clusters of high mortality rate are placed in regions with low amount of cardiologists, income and schooling.