1. Gael M. Martin is Professor, Department of Econometrics and Business Statistics, Monash University, Melbourne, Australia
2. David T. Frazier is Associate Professor, Department of Econometrics and Business Statistics, Monash University, Melbourne, Australia
3. Christian P. Robert is Professor, Université Paris-Dauphine, Paris, France, and Department of Statistics, Warwick University, Coventry, UK