A minimum of three biopsies were obtained from each participant from the following locations: the inferior antrum turn 3 cm from the pyloric ring, the superior antrum turn 5 cm from the pyloric ring, and middle third of the superior turn at mid-line 16.
Un mínimo de tres biopsias fueron obtenidas en todos los participantes así: antro curva menor a 3 cm del anillo pilórico, antro curva mayor a 5 cm del anillo pilórico y tercio medio curva mayor, línea media 16.