1. Harvard Medical School, Wellman Center for Photomedicine, 40 Blossom Street, Boston, MA 02144, USA ()
2. Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139, USA
3. Optisches Institut, Technische Universität Berlin, Straße des 17 Juni 135, 10623 Berlin, Germany
4. Institut de Materiaux Jean Rouxel, 2 rue de la Houssinière, BP 32229, 44322 Nantes Cedex 03, France