https://www.cadth.ca/sites/default/files/pdf/108_No15_pleconaril_edrug_f.pdf https://www.cadth.ca/sites/default/files/pdf/108_No15_pleconaril_edrug_e.pdf 2001 Canada English French pleconaril common cold oxadiazoles antiviral agents treatment outcome canada Evidence-Based medicine adult administration, oral oxadiazoles drug evaluation