P4HTM and rapid-onset childhood obesity-hypothalamic dysfunction-hypoventilation-autonomic dysregulation syndrome: <b>Conclusion:</b> In the case of clinical evidence of ROHHAD in a child with abnormal neurological development or eye abnormalities, we suggest that the <i>P4HTM</i> gene be systematically interrogated in addition to the analysis of the <i>PHOX2B</i> gene.