[1] Manaia Primary Hlth Org, POB 1878, Whangarei 0140, New Zealand
[2] Te Tai Tokerau Primary Hlth Org, POB 1878, Whangarei 0140, New Zealand
[3] Univ Auckland, Sch Med, Private Bag 92019, Auckland 1142, New Zealand
[4] Middlemore Hosp, Dept Rheumatol, Private Bag 93311, Auckland 1640, New Zealand
[5] Bush Rd Med Ctr, POB 4320, Kamo 0112, Whangarei, New Zealand
[6] Northland Dist Hlth Board, Private Bag 9742, Whangarei 0148, New Zealand
[7] Counties Manukau Dist Hlth Board, Private Bag 94052, South Auckland Mail Cent 2240, New Zealand