HOspital Versus Primary Care Breath Test Environment (HOPE) Study

"Participants will perform breath testing in Primary care followed by Secondary care on Day 1. At each location, participants will be asked to perform three breath tests (15 minutes apart). The environmental air will also be sampled.~This entire process will be repeated in the reverse order (i.e. breath testing in Secondary care followed by Primary care on Day 2).~Participants will be asked to maintain a clear fluid diet for a minimum of six hours prior to breath collection on both Day 1 and Day 2 of sampling."