Please use this form to submit questions to the OHS. If you feel you need more information than what is provided on this website, please call 1-866-606-0686 to speak with a member of our Study Team. Our call centre is open Monday to Friday from 9 a.m. to 5 p.m. Please note that if you leave a voicemail, an OHS call centre responder will return your call. If you are not available at that time, the OHS will leave a voicemail for you if the feature is available.