title: Crown-rump length and pH probe length.
authors.forename: S G
authors.initials: SG
authors.lastname: Jolley
mesh_terms: D001827:Body Height; D002648:Child; D004947:Esophagus / Q000033:anatomy & histology*; D005745:Gastric Acidity Determination; D006801:Humans; D006863:Hydrogen-Ion Concentration