In the spring of 2004 , the people voted for merging the neighboring municipalities of Chiggiogna , Osco , Mairengo , Calpiogna , Campello , Rossura , Calonico , Anzonico , Cavagnago , and Sobrio . In the spring of 2004 , the residents voted for incorporating the surrounding municipalities of Chiggiogna , Osco , Mairengo , Calpiogna , Campello , Rossura , Calonico , Anzonico , Cavagnago , and Sobrio .