%0 Journal Article
%T Letter to the Editor: Preference option randomized design (PORD) for comparative effectiveness research: Statistical power for testing comparative effect, preference effect, selection effect, intent
%A Gordon Guyatt
%A Kameshwar Prasad
%A Petra Macaskill
%A Richard Cook
%A Robin Turner
%A SD Walter
%J Statistical Methods in Medical Research
%@ 1477-0334
%D 2019
%R 10.1177/0962280218767691
%U https://journals.sagepub.com/doi/full/10.1177/0962280218767691