 Fecal Sample Collection Patients and healthy controls will collect fecal samples at home using the investigators well-established protocol. Stool samples will be collected and transferred to a sterile screw capped sample jar and placed in a standard household freezer. The samples will be transported on the cooling pad to study personnel at the MacAnxiety Research Centre where they will be stored in a study freezer before transport to McMaster University. In the laboratory, part of the stool sample will be transferred into four 2-ml cryovials and snap frozen using liquid nitrogen for molecular analysis of microbiota. 