[1] Royal North Shore Hosp, Dept Dermatol, Reserve Rd, Sydney, NSW, Australia
[2] Univ Sydney, Sydney Med Sch Northern, Sydney, NSW, Australia
[3] Royal North Shore Hosp, Dept Haematol, Sydney, NSW, Australia
[4] Northern Sydney Local Hlth Dist, Kolling Inst, Northern Blood Res Ctr, Sydney, NSW, Australia