[1] Tuhauora Med Associates, Te Piringa Kotuku, 75 Shortland Rd, Auckland 1010, New Zealand
[2] Univ Auckland, Dept Gen Practice & Primary Hlth Care, 85 Pk Rd, Auckland 1010, New Zealand
[3] Univ Auckland, Fac Med & Hlth Sci, 85 Pk Rd, Auckland 1010, New Zealand
[4] Univ Auckland, Sch Populat Hlth, Sect Epidemiol & Biostat, 85 Pk Rd, Auckland, New Zealand
[5] Christchurch Hosp, Dept Otorhinolaryngol, Te Whatu Ora Hlth New Zealand, 2 Riccarton Ave, Christchurch 4710, New Zealand
[6] Te Ohu Rata O Aotearoa Maori Med Practitioners Ass, Aotearoa, New Zealand