Response to correspondence from the ESSA Statement authors. Issue 4 (April 2018) - Martin Ginis, Kathleen; Scheer, Jan; Latimer-Cheung, Amy; Barrow, Andy; Bourne, Chris; Carruthers, Peter; Bernardi, Marco; Ditor, David; Gaudet, Sonja; Groot, Sonja; Hayes, Keith; Hicks, Audrey; et al.