Differentiation of human cytomegalovirus (CMV) glycoprotein B and glycoprotein H types by restriction fragment length polymorphism — association of glycoprotein types with CMV disease in heart, heart-lung and lung transplant recipients: T.G. Wreghitt, A.J. Rostron, J.J. Gray, K. McNeil, J. Parameshwar, S.R. Large, J. Wallwork, Papworth Hospital NHS Trust, Cambridge, UK