Erratum to “Gastric and Rectal Metastases from Malignant Melanoma Presenting with Hypochromic Anemia and Treated with Immunotherapy” - Pietro Genova; Maria Sorce; Daniela Cabibi; Gaspare Genova; Vittorio Gebbia; Daniele Galanti; Chiara Ancona; Mara Rosaria Valerio (Case Reports in Oncological Medicine)