Hyperthermia classic commentary: 'Hyperthermia as an adjuvant to radiation therapy of recurrent or metastatic malignant melanoma. A multicentre randomized trial by the European Society for Hyperthermic Oncology' by J. Overgaard, D. Gonzalez Gonzalez, M. C. C. H. Hulshof, G. Arcangeli, O. Dahl, O. Mella & S. M. Bentzen, International Journal of Hyperthermia 1996; 12: 3-20