Letters to the Editor; Authors: G. Hernández-Molina, D. Aguilar-León, B. Fisher-Bautista, A. Romero-Beltrán, L.M. Amezcua-Guerra, A. Aranda-Frausto, M.L. Loredo, J. Furuzawa-Carballeda, G. Fonseca-Camarillo
Hernández-Molina et al. (Tue,) studied this question.