1 Dipartimento di Cure primarie, Ausl Modena, Italia - Dipartimento di Scienze biomediche, metaboliche e neuroscienze, Università di Modena e Reggio Emilia, Modena, Italia.
2 Department of Family medicine, The University of Toledo College of medicine and life sciences, Toledo, Ohio, Usa.
3 Department of General practice, University Hospital Würzburg, Germany.