Sibling-controlled study of the impact of dietary therapy on the gut microbiota in children with phenylketonuria. - Ohmi-Shimizu N; Takano C; Tsuji NM; Iwama M; Okamura N; Komine-Aizawa S; Hayakawa S; Ogawa E; Morioka I; Ishige M (Frontiers in nutrition, 2026)