1. University of Waterloo,Department of System Design Engineering,Waterloo,ON,Canada,N2L 3G1
2. University of Twente,Department of Biomechanical Engineering,Enschede,AE,The Netherlands,7500
3. Technical Medical Centre, University of Twente,Magnetic Detection & Imaging group,Enschede,AE,The Netherlands,7500
4. Delft Univer-sity of Technology,Department of Microelectronics,Delft,AA,The Netherlands,2600