Jerry J. Batzel is Research Associate at the Institute for Mathematics and Scientific Computing at the University of Graz, Austria. Franz Kappel is Full Professor and Department Head at the Institute for Mathematics and Scientific Computation at the University of Graz, Austria. Daniel Schneditz is Associate Professor and Director at the Laboratory for Extracorporeal Analysis and Diagnosis (LEAD) at the Institute of Physiology at the Medical University of Graz, Austria. Hien T. Tran is Professor and Associate Head at the Department of Mathematics at North Carolina State University, Raleigh, USA.