H. Sanli, P. Ekmekci, F. Kusak, M. Arat, and M. Beksaç, “Hyperkeratosis of the nipple associated with chronic graft versus host disease after allogeneic haematopoietic cell transplantation”, Acta Derm Venereol, vol. 83, no. 5, pp. 385–386, Nov. 2003.