Letter by Mitchell et al Regarding Article, "Urinary Prostaglandin Metabolites: An Incomplete Reckoning and a Flush to Judgment". - Mitchell,JA; Knowles,RB; Kirkby,NS; Reed,DM; Edin,ML; White,WE; Chan,MV; Longhurst,H; Yaqoob,MM; Milne,GL; Zeldin,DC; Warner,TD (Circulation Research, 2018)