MATERIALS AND METHODS Study design and sample collection. Fecal samples were collected from an intervention trial with exclusively formula-fed infants, aged 28 to 90 days, receiving a standard formula (SF group; age, 60.3 6.9 days [mean the standard
MATERIALS AND METHODS Study design and sample collection. Fecal samples were collected from an intervention trial with exclusively formula-fed infants, aged 28 to 90 days, receiving a standard formula (SF group; age, 60.3 6.9 days [mean the standard