- Influence of systemic photochemotherapy on regulatory T cells and selected cytokine production in psoriatic patients: a pilot study. Rotsztejn, H., Zalewska, A., Trznadel-Budźko, E., Lewkowicz, P., Banasik, M., Tchórzewski, H., Głowacka, E. Med. Sci. Monit. (2005)