Nicolaas, Gerry, Pamela Campanelli, Steven Hope, Annette Jäckle, and Peter Lynn. 2015. “Revisiting "yes No" Versus ‘check All That apply’: Results from a Mixed Modes Experiment”. Survey Research Methods 9 (3):189-204. https://doi.org/10.18148/srm/2015.v9i3.6151.