V. Chambers

Haemochromatosis-associated HFE genotypes in English blood donors: age-related frequency and biochemical expression.

A. Rigby, R. Sokol, A. Dalton, 2003, Journal of hepatology.

The heritability of melatonin secretion and sensitivity to bright nocturnal light in twins

Trevor R. Norman, J. Olver, K. Hallam, 2006, Psychoneuroendocrinology.