PHKG2 and disorder of glycogen metabolism: Next-generation sequencing of genes associated with glycogen storage diseases was requested (AGL, ADLDOA, ALDOB, ENO3, EMP2A, FBP1, G9PC, GAA, GBE1, GYG1, GYS1, LAMP2, LDHA, NHLRC1, PFKM, PGAM2, PGK1, PGM1, PHKA2, PHKB, PHKG2, PRKAG2, PYGL, PYGM, SLC2A2, and SLC37A4).