PHOX2B and sudden infant death syndrome: To search for PHOX2B variants that could underlie severe perinatal conditions with, similarly to CCHS, alterations of the autonomous nervous system, the three PHOX2B exons have been analyzed in 12 IALTE (7 females and 5 males) patients and a group of 7 unexpected dead infants, including 6 SUID and 1 SIDS (2 females and 5 males).