Comparing Spirometric Reference Values From Childhood to Old Age Estimated by LMS and Linear Regression Models David Martínez-Briseño; Laura Gochicoa-Rangel; Luis Torre-Bouscoulet; Silvia Cid-Juárez; Rosario Fernández-Plata; Luisa Martínez-Valdeavellano; Sofía Chapela-Lara; Rodrigo del Río-Hidalgo; Rogelio Pérez-Padilla;