ten Hoeve, A. L., Roda, M. A., Redegeld, F., Folkerts, G., Edwin Blalock, J., & Gaggar, A. "Proline-Glycine-Proline as a Potential Biomarker in Chronic Obstructive Pulmonary Disease and Cystic Fibrosis", TANAFFOS (Respiration), 11, 4(autumn), 2012, 12-15.