Prof Cobanoglu along with Faizan Ali, Khuraman Shahtakhtinskaya and Luana Nanu have conducted a study on the use of masks in hotels, restaurants, hairdressers, banks and grocery stores by service people. This study has been featured in an article by The Conversation on January 25, 2021.
Read the article here. https://theconversation.com/yes-customers-do-like-it-when-waiters-and-hairdressers-wear-a-mask-especially-if-its-black-152517