1. Department of Electrical Engineering, Eindhoven University of Technology, Eindhoven, The Netherlands
2. Patient Care and Monitoring, Philips Research, Eindhoven, The Netherlands
3. Department of Electronics, Information and Bioengineering, Politecnico di Milano, Milano, Italy
4. Sleep Medicine Center Kempenhaeghe, Heeze, The Netherlands
5. Department of Obstetrics and Gynecology, Máxima Medical Centrum, Veldhoven, The Netherlands