Ultrasonography reference values for the calcaneus in children and adolescents living at high altitude in Peru - Fuentes-López, Jose; Vidal-Espinoza, Rubén; Mamani-Luque, Ofelia; Ibanez-Quispe, Vladimiro; Villegas-Abrill, Claudia; Canqui-Flores, Bernabé; Mendoza-Mollocondo, Charles Ignacio; Sanchez-Macedo, Lucila; Cossio-Bolaños, Marco; Gomez-Campos, Rossana (Frontiers in Endocrinology, 2025)