STATISTICAL ANALYSIS OF THE INCIDENCE OF THE RETRACTION SYNDROME OF THE ISCHIOTIBIAL MUSCLES STUDIED IN HEALTHY INFANT GROUPS AND ITS RELATION TO KYPHOSIS
AN'ALISIS ESTAD'ISTICO DE LA FRECUENCIA DEL S'INDROME DE &quot;RETRACCI'ON&quot; DE LOS ISQUIOTIBIALES ESTUDIADO EN COLECTIVIDADES INFANTILES SANAS Y SU RELACI'ON CON EL DORSO CURVO