Intra-individual stability and developmental change in hair cortisol among postpartum mothers and infants: Implications for understanding chronic stress.
Liu CH, Snidman N, Leonard A, Meyer J, Tronick E. Intra-individual stability and developmental change in hair cortisol among postpartum mothers and infants: Implications for understanding chronic stress. Dev Psychobiol. 2016 May; 58(4):509-18.