Subject(s)

Cyclopentanes/adverse effects , Diseases in Twins , Infant, Premature, Diseases/chemically induced , Mydriatics/adverse effects , Phenylacetates/adverse effects , Black or African American , Chromatography, Gas , Cyclopentanes/administration & dosage , Cyclopentanes/blood , Enterocolitis, Pseudomembranous/chemically induced , Humans , Infant, Newborn , Male , Methylamines/administration & dosage , Methylamines/adverse effects , Methylamines/blood , Mydriatics/administration & dosage , Mydriatics/blood , Phenylacetates/administration & dosage , Phenylacetates/blood