1. School of Physics, The University of New South Wales, Sydney, NSW 2052, Australia
2. Australian Nuclear Science and Technology Organisation, Lucas Heights, NSW 2234, Australia
3. Mass Spectrometry Core Facility, University of Sydney, Sydney, NSW 2006, Australia
4. Department of Biochemistry and Molecular Biology, Monash University, Clayton, VIC 3800, Australia
5. Department of Physics, University of Durham, Durham, U.K.
6. Centre for Applied Medical Research, St Vincent's Hospital, Sydney, NSW 2010, Australia