Study of natural health product adverse reactions (SONAR): active surveillance of adverse events following concurrent natural health product and prescription drug use in community... oleh Sunita Vohra, Kosta Cvijovic, Heather Boon, Brian C Foster, Walter Jaeger, Don LeGatt, George Cembrowski, Mano Murty, Ross T Tsuyuki, Joanne Barnes, Theresa L Charrois, John T Arnason, Candace Necyk, Mark Ware, Rhonda J Rosychuk