Viljoen, M., A. Panzer, A. Koorts, P. Henn, and J. van den Bogaerde. “The Effects of Probiotics on Symptoms and Immunoglobulin Levels of Patients With Irritable Bowel Syn-Drome”. Suid-Afrikaans Tydskrif Vir Natuurwetenskap En Tegnologie / <i>South African Journal of Science and Technology</I&gt;, Vol. 23, no. 1/2, Sept. 2004, pp. 22-24, doi:10.4102/satnt.v23i1/2.189.