"Educating doctors is a long and expensive process, but not every country can reward its graduates equally. Health spending per capita varies drastically in EU countries, from €816 per year in Romania to more than €4,000 in Luxembourg, Germany and other Western European countries. And so doctors and nurses follow the money."

https://www.politico.eu/article/doctors-nurses-migration-health-care-crisis-workers-follow-the-money-european-commission-data/