1. JEOL Ltd., 3-1-2 Musashino, Akishima, Tokyo 196-8558, Japan
2. BioNet Laboratory Inc., 2-3-28 Nishiki-chou, Tachikawa, Tokyo 190-0022, Japan
3. National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565, Japan