Inês Paciência1, André Moreira2. 1. Institute of Public Health, University of Porto, Porto, Portugal; Institute of Mechanical Engineering and Industrial Management, Porto 4200-465, Portugal. Electronic address: inespaciencia@gmail.com. 2. Institute of Public Health, University of Porto, Porto, Portugal; Faculty of Medicine, University of Porto, Porto, Portugal; Faculty of Nutrition and Food Sciences, University of Porto, Porto, Portugal.