KIDAPAWAN CITY -- At least 16 elementary pupils in a remote village in Aleosan, North Cotabato were hospitalized after eating what they believed were spoiled siopao Friday, school officials said.Joel Calambro Sr., principal ofDualing Elementary School in Barangay Dualing, Aleosan, North COtabato, said about an hour after the recess time, some 16school children complained of stomach pain and nausea, prompting school teachers to rush them to nearby Aleosan District Hospital.Speaking over DXMS Radyo Bida,Calambro admitted the siopao were sold at the school canteen The siopao supplier was