1. GlaxoSmithKline, Stevenage SG1 2NY, United Kingdom
2. Division
of Advanced Materials and Healthcare Technologies, School of Pharmacy, University of Nottingham, University Park, Nottingham NG7 2RD, United Kingdom
3. National
Centre of Excellence in Mass Spectrometry Imaging (NiCE-MSI), National Physical Laboratory (NPL), Teddington, Middlesex TW11 0LW, United Kingdom