 Complete the following phrase:  Kenteris specialised in the 200 m and 400 m. His first national titles were the three consecutive 400 m gold medals at the Greek Athletics Championships 1991 46.90, 1992 46.85, 1993 46.27 in Athens with 200 m 21.57 and 400 m 47.76 gold medals at the 1993 Greek Indoor Athletics Championships in Piraeus, representing his home town team, Arion Mytilene. He also competed at the 