Comment to the reply letter: Letter to the Editor: Preference option randomized design (PORD) for comparative effectiveness research: Statistical power for testing comparative effect, preference effect, selection effect, intent-to-treat effect, and overall effect (SMMR, Vol. 28, Issue 2, 2019). (May 2019) - Walter, SD; Macaskill, Petra; Turner, Robin; Guyatt, Gordon; Cook, Richard; Prasad, Kameshwar