D. D. de Koning

Purine enzyme activities in recent onset rheumatoid arthritis: are there differences between patients and healthy controls?

P. Kerstens, R. D. De Abreu, L. van de Putte, 1996, Annals of the rheumatic diseases.

Reduced purine 5’-nucleotidase activity in lymphocytes of patients with systemic lupus erythematosus: results of a pilot study

L. V. D. van de Putte, R. D. De Abreu, A. Boerbooms, 1999, Annals of the rheumatic diseases.

Reduced thiopurine methyltransferase activity and development of side effects of azathioprine treatment in patients with rheumatoid arthritis.

R. D. De Abreu, L. van de Putte, W. Muller, 1998, Arthritis and rheumatism.

Purine enzyme activities in peripheral blood mononuclear cells: comparison of a new non-radiochemical high-performance liquid chromatography procedure and a radiochemical thin-layer chromatography procedure.

P. Kerstens, R. D. De Abreu, L. van de Putte, 1995, Journal of chromatography. B, Biomedical applications.