Facial Hyperpigmentation during Imatinib Therapy for Gastrointestinal Stromal TumorImene Hamza, Emna Gaies, Sarrah Kastalli, Riadh Daghfous et Sihem El AidliTherapie, 69 3 (2014) 245-247DOI: https://doi.org/10.2515/therapie/2014018