[1] St George Hosp, Dept Dermatol, Sydney, NSW, Australia
[2] Premier Specialists Res & Dev, Sydney, NSW, Australia
[3] Univ New South Wales, Fac Med, Randwick, NSW, Australia
[4] Univ Desarrollo, Clin Alemana, Fac Med, Clin Alemana Santiago, Santiago, Chile
[5] Univ Sydney, Fac Math & Stat, Sydney, NSW, Australia
[6] Univ Sydney, Fac Med, Sydney, NSW, Australia