[1] Royal Victoria Hosp, Reg Virus Lab, Belfast BT12 6BA, Antrim, North Ireland
[2] Royal Victoria Hosp, Royal Belfast Hosp Sick Children, Belfast BT12 6BA, Antrim, North Ireland
[3] Queens Univ Belfast, Dept Child Hlth, Belfast BT12 6BA, Antrim, North Ireland
[4] Mater Hosp, Dept Resp Med, Belfast BT14 6AB, Antrim, North Ireland
[5] Royal Victoria Hosp, Physiotherapy Dept, Belfast BT12 6BAB, Antrim, North Ireland