JP, JK, K-YK made the clinical diagnosis, and clinical management decisions. They supervised the drafting of the manuscript. JP drafted the first manuscript and reviewed the literature. S-TP, JK, K-YK revised it critically. JK supported making the diagnosis and clinical management decisions as the specialists of genetic study and performed genetic analysis of GFAP. K-YK supervised the drafting of the manuscript and revised it critically. All authors have read and approved the final manuscript.