Corrigendum to 'Affective analytics of demonstration sites' [Eng. Appl. Artif. Intell. 81 (2019) 346–372]. (May 2019) - Kaklauskas, A.; Jokubauskas, D.; Cerkauskas, J.; Dzemyda, G.; Ubarte, I.; Skirmantas, D.; Podviezko, A.; Simkute, I.