Peter Roetheli. Erste-Hilfe Schulungen, BLS-AED Kurse, Sanitätsdienst. Schaffhausen. is located in Hallau, Switzerland on Lopengraben 7. Peter Roetheli. Erste-Hilfe Schulungen, BLS-AED Kurse, Sanitätsdienst. Schaffhausen. is rated 5 out of 5 in the category emergency training in Switzerland.