4.1. Participants and Stimuli
Healthy adults trained as sensory panelists were enrolled in a multisession study as trained sensory panelists to evaluate the taste of a variety of pediatric liquid formulations and excipients, one of which was an over-the-counter (OTC) sweetened suspension containing ibuprofen (100 mg/5 mL, 2% The study was temporarily halted from March to July 2020 due to the COVID-19-related discontinuation of nonessential human subject research in Philadelphia. Upon study resumption in August 2020, we adapted the testing facility and received IRB approval to implement several procedures to reduce risks to study staff and participants. In addition to screening for COVID-19 symptomatology, we administered the National Institute of Health Olfaction Toolbox test [