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George AO, Shittu OB, Enwerem E, Wachtel M, Kuti O. The incidence of lower mid-trunk hyperpigmentation (linea nigra) is affected by sex hormone levels. J Natl Med Assoc. May 2005, roč. 97, čís. 5, s. 685–688. Dostupné online. PMID15926645.