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Bozzola M, Travaglino P, Marziliano N, Meazza C, Pagani S, Grasso M, et al. (November 2009). "The shortness of Pygmies is associated with severe under-expression of the growth hormone receptor". Molecular Genetics and Metabolism. 98 (3): 310–313. doi:10.1016/j.ymgme.2009.05.009. PMID19541519.