1. From the North West Regional Heart Centre and Heart and Lung Transplant Unit, University Hospital of South Manchester, Wythenshawe, Manchester, United Kingdom (C.A.M., S.C., S.G.R., J.S., S.G.W., N.Y., M.S.); and Harefield Hospital, Royal Brompton and Harefield NHS Trust, Middlesex, London, United Kingdom (T.K.M.).