[1] Western Gen Hosp, MRC Human Genet Unit, Edinburgh EH4 2XU, Midlothian, Scotland
[2] Univ Edinburgh, Sch Med, Community Hlth Sci, Edinburgh EH8 9AG, Midlothian, Scotland
[3] Univ Split, Fac Med, Croatian Ctr Global Hlth, Split 21000, Croatia
[4] Univ Edinburgh, Inst Evolutionary Biol, Edinburgh EH9 3JT, Midlothian, Scotland
[5] Ninewells Hosp & Med Sch, Biomed Res Ctr, Populat Pharmacogenet Grp, Dundee DD1 9SY, Scotland
[6] Univ Zagreb, Fac Med, Andriji Stampar Sch Publ Hlth, Zagreb 10000, Croatia
[7] Tech Univ Dresden, Carl Gustav Carus Med Sch, Dept Internal Med, Div Pathol Biochem & Rheumatol, D-01307 Dresden, Germany
[8] Guys & St Thomas Hosp, Univ London Kings Coll, Dept Chem Pathol, Purine Res Lab, London SE1 9RT, England
[9] Univ Edinburgh, Western Gen Hosp, Rheumat Dis Unit, Sch Mol & Clin Med, Edinburgh EH4 2XU, Midlothian, Scotland
[10] Univ Edinburgh, Western Gen Hosp, Colon Canc Genet Grp, Sch Mol & Clin Med, Edinburgh EH4 2XU, Midlothian, Scotland
[11] Inst Anthropol Res, Zagreb 10000, Croatia
[12] Univ Edinburgh, Sch Clin Sci & Community Hlth, Edinburgh EH16 4SB, Midlothian, Scotland
[13] Ninewells Hosp & Med Sch, Div Med Therapeut, Diabet Res Grp, Dundee DD1 9SY, Scotland