1. Paderborn University,Sensor Technology Department,Paderborn,Germany
2. Universidade Federal do Rio Grande do Sul,Departamento de Engenharia Elétrica,Porto Alegre,Brazil
3. University of Pretoria,Electronics and Microelectronics Group,Pretoria,South Africa
4. Fraunhofer ENAS,Advanced System Engineering (ASE),Paderborn,Germany