Ruano, D., Macedo, A., Soares, M. J., Valente, J., et al. (2007). Transthyretin: No association between serum levels or gene variants and schizophrenia. Journal of Psychiatric Research, 41(8), 667 - 672.

Ruano, D., Macedo, A., Dourado, A., Soares, M. J., et al. (2004). NR4A2 and schizophrenia: Lack of association in a Portuguese/Brazilian study. American Journal of Medical Genetics - Neuropsychiatric Genetics, 128 B(1), 41 - 45.