Martins, M.C., Rodrigues, M.O., Gomes, M.A., Fonseca, A., Freitas, M.M., Miguel, J.P. and Gomes, E.M. 1994. The Program of External Quality Evaluation in Clinical Chemistry. An overview and evaluation after 11 years of functioning. Acta Médica Portuguesa. 7, 9 (Sep. 1994), 519–25. DOI:https://doi.org/10.20344/amp.2957.