1. National Centre for Disease Prevention and Health Promotion, Italian National Institute of Health (Istituto Superiore di Sanità), Viale Regina Elena 299, 00161 Rome, Italy
2. Council for Agricultural Research and Economics-Research Centre for Food and Nutrition, Via Ardeatina 546, 00178 Rome, Italy
3. ASL Napoli 3 Sud, Via Marconi 66, 80059 Torre del Greco, Italy