Healthy infants were randomized ( 1:1 ) to receive PCV13 + P80 or PCV13 without P80 given at ages 2 , 3 , 4 and 12 months concomitantly with DTaP-IPV-Hib at 2 , 3 and 4 months ; hepatitis B at 2 months and measles , mumps , and rubella at 12 months .