Apremilast for the treatment of pustular psoriasis induced by neoadjuvant ifosfamide + etoposide chemotherapy for Ewing Sarcoma: a case report - Mario Valenti; Luigi Gargiulo; Luciano Ibba; Alexia Bertuzzi; Sofia Manara; Francesco Toso; Antonio Costanzo; Alessandra Narcisi (Journal of Dermatological Treatment)