@inbook {6086, title = {Mass spectrometry imaging for the investigation of intratumor heterogeneity}, booktitle = {Advances in Cancer Research}, volume = {134}, year = {2017}, pages = {201-230}, publisher = {Elsevier}, organization = {Elsevier}, doi = {10.1016/bs.acr.2016.11.008}, author = {Balluff, B and Hanselmann, M. and Heeren, R. M. A.} }