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	1.	Reduced purine 5'-nucleotidase activity in lymphocytes of patients with systemic lupus erythematosus: results of a pilot study. [electronic resource] by Stolk, J N de Koning, D G Pennings, A H De Abreu, R A van de Putte, L B Boerbooms, A M Producer: 19990603 In: Annals of the rheumatic diseases vol. 58 Online resources: Available from publisher's website Availability: No items available. Save to lists Add to cart (remove)
	2.	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. [electronic resource] by Stolk, J N De Abreu, R A Boerbooms, A M de Koning, D G de Graaf, R Kerstens, P J van de Putte, L B Producer: 19951002 In: Journal of chromatography. B, Biomedical applications vol. 666 Online resources: Available from publisher's website Availability: No items available. Save to lists Add to cart (remove)
	3.	Reduced thiopurine methyltransferase activity and development of side effects of azathioprine treatment in patients with rheumatoid arthritis. [electronic resource] by Stolk, J N Boerbooms, A M de Abreu, R A de Koning, D G van Beusekom, H J Muller, W H van de Putte, L B Producer: 19981103 In: Arthritis and rheumatism vol. 41 Online resources: Available from publisher's website Availability: No items available. Save to lists Add to cart (remove)
	4.	Purine enzyme activities in recent onset rheumatoid arthritis: are there differences between patients and healthy controls? [electronic resource] by Stolk, J N Boerbooms, A M De Abreu, R A Kerstens, P J de Koning, D G de Graaf, R Mulder, J van de Putte, L B Producer: 19970107 In: Annals of the rheumatic diseases vol. 55 Online resources: Available from publisher's website Availability: No items available. Save to lists Add to cart (remove)