Adjuvant malignant mesothelioma radiotherapy: How many difficulties! In regard to: Allen et al. Fatal pneumonitis associated with intensity-modulated radiation therapy for mesothelioma (Int J Radiat Oncol Biol Phys 2006;65:640-645) and Gupta et al. Hemithoracic radiation therapy after pleurectomy/decortication for malignant pleural mesothelioma (Int J Radiat Oncol Biol Phys 2005;63:1045-1052)