1. Laboratory for Cell and Tissue Engineering, Department of Obstetrics; University Hospital Zurich; Schmelzbergstrasse 12, PATH G 48b 8091 Zurich Switzerland
2. Laboratory of Biosensors and Bioelectronics; ETH Zurich Zurich Switzerland
3. Institute of Bioengineering, Ecole Polytechnique Fédérale de Lausanne (EPFL); Station 15, Bld AI 1109 1015 Lausanne Switzerland