[1
]
Physio-Control/Jolife AB, Ideon Science Park, Lund, Sweden. Electronic address: bjarne.madsen.hardig@physio-control.com.
[2
]
Department of Cardiology, Lund University, Lund, Sweden.
[3
]
Department of Anaesthesiology and Intensive Care, Lund University, Lund, Sweden.
[4
]
CAS Medical Systems, Inc., Branford, CT 06405, USA.