- D S Karbing: Respiratory and Critical Care Group (Rcare), Department of Health Science and Technology, Aalborg University, Aalborg, Denmark. dank@hst.aau.dk.
- G Perchiazzi: Department of Surgical Sciences, The Hedenstierna Laboratory, Uppsala University, Uppsala, Sweden.
- S E Rees: Respiratory and Critical Care Group (Rcare), Department of Health Science and Technology, Aalborg University, Aalborg, Denmark.
- M B Jaffe: Cardiorespiratory Consulting, LLC, Cheshire, CT, USA.