He received his medical degree in December 1921 and moved to Villeneuve-sur-Yonne, where he received payment for his services both from the patients and from government medical assistance funds.
Степень доктора медицины Петио получил в декабре 1921 года и переехал в Вильнёв-Сюр-Ион, где получал оплату за свои услуги как со стороны пациентов, так и стороны правительства.