Translate the paragraph into ordinary english.
hereditary hemochromatosis (hh) is an inherited disorder of iron metabolism, with an estimated prevalence of 0.25-0.50% among caucasians. an epidemiological study is currently underway to determine the prevalence, as well as the genetic and environmental determinants, of iron overload related to hereditary hemochromatosis in a multiethnic early initiation of therapeutic phlebotomy before organ damage occurs may restore a normal life expectancy and improve symptoms.