1. Department of Electronics and Communication Engineering, Istanbul Technical University, Istanbul, Turkey
2. Kartal Research and Development Center, Siemens Sanayi Ticaret A.S., Istanbul, Turkey
3. Department of Biomedical Engineering, Istanbul Medeniyet University, Istanbul, Turkey
4. Department of Electrical and Computer Engineering, Technical University of Munich, Munich, Germany
5. Information and Communications Research Group, Informatics Institute, Istanbul Technical University, Istanbul, Turkey