1. Michael Barber Centre for Collaborative Mass Spectrometry, Manchester Institute of Biotechnology and Photon Science Institute, University of Manchester, 131 Princess Street, M1 7DN, Manchester, UK
2. Dipartimento di Chimica e Tecnologie del Farmaco, Università di Roma “La Sapienza”, 00185, Rome, Italy
3. Waters Corporation, Stamford Avenue, Altrincham Road, SK9 4AX, Wilmslow, UK