ANNOUNCEMENT – INVITATION TO SUBMIT TECHNICAL SPECIFICATIONS AND STANDARDS» RELATED TO THE international open single tender procedure for "Security services" in accordance with the Healthcare Supplies, Medicines and Services 2014 (Abbreviation in Greek "Π.Π.Υ.Φ.Υ.'') Program on behalf of the Hospitals of 4th Health Region of Macedonia and Thrace. AUTHORIZED ECONOMIC OPERATOR: G. H. OF THESSALONIKI AGIOS PAVLOS