1. School of Engineering, University of Borås, SE-50190 Borås, Sweden, Chemical and Biological Engineering, Chalmers University of Technology, SE-41296 Göteborg, Sweden, Department of Clinical Bacteriology, University of Göteborg, SE-41346 Göteborg, Sweden, and Rexcell Tissue & Airlaid AB, SE-66625 Bengtsfors, Sweden