title: Reply to H. Läubli et al.
authors.affiliation: School of Medicine, Cardiff University, Neuadd Meirionnydd, Heath Park, Cardiff, United Kingdom fergus.macbeth@btinternet.com.
authors.forename: Fergus R
authors.initials: FR
authors.lastname: Macbeth
authors.affiliation: School of Medicine, Cardiff University, Neuadd Meirionnydd, Heath Park, Cardiff, United Kingdom.
authors.forename: Simon
authors.initials: S
authors.lastname: Noble