Acknowledgements
We want to thank the staff at our lab facility for technical assistance and senior engineer Dr. Susana V. Gonzalez for performing the sample preparation and UPLC-MS/MS analysis of dopamine. Analysis was performed at the Mass Spectrometry Lab at the Faculty of Natural Sciences (NV), NTNU. This work was supported by the Norwegian University of Science and Technology (NTNU) and the Research Council of Norway through its Centres of Excellence funding scheme, project no. 223257/F50.