| OMGE (World Gastroenterology Organisation) working group on role of gastroenterologist in management of GI cancer patients | 01/1999 - 12/1999 | committee member | | |
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| OMICS group, Journal of Bioanalysis & Biomedicine | 07/2009-present | Editorial board member | | |
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| OMICS group, Journal of Bioequivalence & Bioavailability | 07/2009-present | Editorial board member | | |
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| OMISC Publishing group | 09/2013- | Executive Editor & Organizer | | | 01/2014- | Executive Editor & Organizer | | |
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| Oncology Social Worker Association | 06/1992-date | Member | | | 2019-date | Fellow | | |
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| Oncotarget (journal) | |
| One Health Initiative, University of California | 01/2010-09/2016 | Member, Workshop Organizer | | |
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| ong Kong Geological Society | |
| Online Information Review journal | |
| Online Learning Consortium | Since 2016 | Community member | | Mr Cheng Cheng Shu Shan |
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| Online News Association | 03/2011 - date | Member (Academic) | | |
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| Ontario Association of Landscape Architects | 01/2008 - present | Full member | | |
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| Ontario College of Pharmacists | |
| Ontario Dental Hygienists Association | |
| Ontario Health Insurance Plan (Billing No. 012399) | |
| Ontario Medical Association (#0655167) | |
| Ontario Medical Association/ Canadian Medical Association | |
| Open Learning: Journal of Open and Distance Learning | 2004 | Invited reviewer for special issue | | Dr Kennedy Kennedy David Miles |
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| Open Linguistics | |
| Open Society "Mapping Digital Media" research project | 2011- current | Commissioner/consultant (1 of 5) | | |
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