title: Reply.
authors.affiliation: Mater Misericordiae University Hospital, Dublin, Ireland. Electronic address: wefong_siah@yahoo.com.
authors.forename: We Fong
authors.initials: WF
authors.lastname: Siah
authors.affiliation: Mater Misericordiae University Hospital, Dublin, Ireland.
authors.forename: James
authors.initials: J
authors.lastname: Loughman
authors.affiliation: Mater Misericordiae University Hospital, Dublin, Ireland.
authors.forename: Colm
authors.initials: C
authors.lastname: O'Brien