aMedical University of Graz, Department of Psychiatry and Psychotherapeutic Medicine, Graz, Austria

bDepartment of Psychiatry, APC Microbiome Ireland, University College Cork, Cork, Ireland

cMedical University of Graz, Division of Immunology and Pathophysiology, Otto Loewi Research Center, Graz, Austria

Correspondence to Sabrina Mörkl, Auenbruggerplatz 31/1, Graz 8036, Austria. Tel: +4331638581743; e-mail: [email protected]