S. Ohgi, M. Fukuda, H. Moriuchi, T. Kusumoto, J. K. Nugent, T. B. Brazelton, K. Arisawa, T. Takahashi and H. Saitoh. Compa- rison of Kangaroo care and standard care: Behavioral organiza- tion, development, and temperament in healthy, low-birth-weight infants through 1 year. Journal of Perinatology, 2002, 22(5): 374- 379.