1. Department of Organic Chemistry, Stockholm University, Arrhenius Laboratory, 106 91 Stockholm (Sweden), Fax: +46 8 154908
2. Applied Electrochemistry, School of Chemical Science and Engineering, Royal Institute of Technology (KTH), 100 44 Stockholm (Sweden)
3. Medical Mass Spectrometry, Department of Pharmaceutical Biosciences, Uppsala University, 75123 Uppsala (Sweden)
4. Department of Analytical Chemistry, Stockholm University, Arrhenius Laboratory, 106 91 Stockholm (Sweden)
5. Biophysics Group, Department of Chemistry, University of Gothenburg, P.O. Box 462, 40530 Gothenburg (Sweden)