A clustered origin for isolated massive stars

WEL and IAB gratefully acknowledge support from the ECOGAL project, grant agreement 291227, funded by the European Research Council under ERC-2011-ADG. MR acknowledges funding from the Nadacia SPP grant No. 28/2013. MG acknowledges support from the Royal Society in the form of a University Research Fellowship (URF) and the European Research Council (ERC-StG-335936, CLUSTERS). This work used the compute resources of the St Andrews MHD Cluster.