Journal of The American Society for Mass Spectrometry Journal of The American Society for Mass Spectrometry, Springer Verlag (Germany), 2018, Epub ahead of print. ⟨10.1007/s13361-018-1900-7⟩ Journal of The American Society for Mass Spectrometry, 2018, Epub ahead of print. ⟨10.1007/s13361-018-1900-7⟩