Commentary on Prospective assessment of gastrointestinal and genitourinary toxicity of salvage radiotherapy for patients with prostate-specific antigen relapse or local recurrence after radical prostatectomy: Pearse M, Choo R, Danjoux C, Gardner S, Morton G, Szumacher E, Loblaw A, Cheung P, Department of Radiation Oncology, Auckland Hospital, Auckland, New Zealand