not-yet-known not-yet-known not-yet-known unknown According to the manufacturer’s instructions, saliva was collected from all participants with Micro SAL™ for children (Oasis Diagnostics® Corporation, Vancouver, WA, USA) at 1 and 2 h after egg yolk ingestion. Participants were asked to refrain from eating for 30 min before collection. Saliva was divided into aliquots, cryopreserved, and frozen at < –20 °C until analysis.