Thank you for sharing your thoughts. Here is the full name of the article you asked about: Ratitch B, Goel N, Mallinckrodt C, Bell J, Bartlett JW, Molenberghs G, Singh P, Lipkovich I, O'Kelly M. Defining Efficacy Estimands in Clinical Trials: Examples Illustrating ICH E9(R1) Guidelines. Ther Innov Regul Sci. 2020 Mar;54(2):370-384.