1. Department of Cell and Molecular Biology, Karolinska Institutet, Berzelius väg 35, 171 77 Stockholm, Sweden
2. Laboratorio de Investigación en Patología Experimental, Hospital Infantil de México Federico Gómez, Avenida Dr. Márquez 162, Colonia Doctores, 06720 México, D.F., Mexico
3. Science for Life Laboratory, Dept. of Applied Physics, Royal Institute of Technology, PO Box 1031, 17121, Solna, Sweden