<unk><unk><unk>  is a rare disease and the data pertaining to its incidence and prevalence is not evidently available. Overall improvement in nutritional status with better medical care has markedly reduced the number of cases of<unk><unk><unk> . However, individuals of any age groups may develop<unk><unk><unk>  and it is most commonly seen in the age group of 40-70 years.<unk><unk><unk>  usually affects individuals of the caucasian race. Females are commonly affected than males with female to male ratio of 4:1. The majority of<unk><unk><unk>  cases are reported in Scandinavian countries or north European countries.
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