1. Department of Family Medicine, The Aga Khan University, Stadium Road, P.O. Box 3500, Karachi 74800, Pakistan
2. Department of Community Health Sciences, The Aga Khan University, Stadium Road, P.O. Box 3500, Karachi 74800, Pakistan
3. Department of Peadiatrics and Child Health, The Aga Khan University, Stadium Road, P.O. Box 3500, Karachi 74800, Pakistan
4. Department of Rheumatology, Waikato Hospital, Pembroke Street, Hamilton 3204, New Zealand