[modified according to Pehamberger et al. J Am Acad Dermatol 1987 and Pehamberger et al. J Invest Dermatol 1993]
[Stolz et al. Eur J Dermatol 1994]
[Menzies et al. Arch Dermatol 1996]
[Argenziano et al. Arch Dermatol 1998]