1. Laboratory of Biometry; University of Thessaly; Phytokou Street 38446 N Ionia-Volos Greece
2. New Zealand Brain Research Institute; 66 Stewart St. Christchurch 8011 New Zealand
3. Department of Psychology; University of Canterbury; Christchurch New Zealand
4. Department of Medicine; University of Otago; Christchurch New Zealand
5. Department of Neurology; Christchurch Hospital; Christchurch New Zealand
6. Division of Biostatistics; University of Southern California Keck School of Medicine; 440 E.Huntington Dr, Suite 400 Arcadia CA 91066 U.S.A.