CPT2 and hyperinsulinemic hypoglycemia, familial, 4: In the pilot study of MS/MS-NBS conducted from 2004 to 2012 in several areas of Japan, CPT II deficiency was diagnosed in 7 (including S-01, N-02, N-03, N-05, N-06, and N-07 in our study) of 1,740,387 newborns, which represented a frequency of 1/248,627.