[1] Univ Otago, Lab Cell & Prot Regulat, Ctr Neuroendocrinol, Christchurch Sch Med & Hlth Sci, Christchurch, New Zealand
[2] Univ Canterbury, MacDiarmid Inst Adv Mat & Nanotechnol, Christchurch, New Zealand
[3] Univ Canterbury, Dept Elect & Comp Engn, Christchurch 1, New Zealand