Biomedical Imaging Group, École polytechnique fédérale de Lausanne (EPFL), Lausanne CH-1015, Switzerland.|Biomedical Imaging Group, École polytechnique fédérale de Lausanne (EPFL), Lausanne CH-1015, Switzerland.|Biomedical Imaging Group, École polytechnique fédérale de Lausanne (EPFL), Lausanne CH-1015, Switzerland.|Biomedical Imaging Group, École polytechnique fédérale de Lausanne (EPFL), Lausanne CH-1015, Switzerland.