Corrigendum to: The Response of Smokers to Health Warnings on Packs in the United Kingdom and Norway Following the Introduction of Standardized Packaging. Issue 12 (3rd May 2021) - Moodie, Crawford; Best, Catherine; Lund, Ingeborg; Scheffels, Janne; Critchlow, Nathan; Stead, Martine; McNeill, Ann; Hitchman, Sara; Mackintosh, Anne Marie