[1] Natl Res Council Canada, Inst Biodiagnost Atlantic, Halifax, NS B3H 3A7, Canada
[2] Dalhousie Univ, Dept Radiol, Halifax, NS B3H 4R2, Canada
[3] Dalhousie Univ, Dept Neurosci, Halifax, NS B3H 4R2, Canada
[4] Dalhousie Univ, Sch Biomed Engn, Dept Med Neurol, Halifax, NS B3H 4R2, Canada
[5] Dalhousie Univ, Dept Chem, Halifax, NS B3H 4R2, Canada
[6] Queen Elizabeth II Hlth Ctr, Halifax, NS B3H 3A7, Canada