Authors’ contributions
PEx
JMH and OH designed the study. PL, GK, AP were responsible for the lipid analysis, and PL acquired the lipid data. ACO provided the PExA instrument and was a consultant for PEx sampling and analysis. PL and OH performed the data analysis and, together with JMH, outlined the manuscript. ACO, GK and AP participated in the manuscript preparation and revised the manuscript. All authors read and approved the final version of the manuscript.