T. T Karppinen, L. Ylianttila, H. Kautiainen, T. Reunala, and E. Snellman, “Empowering Heliotherapy Improves Clinical Outcome and Quality of Life of Psoriasis and Atopic Dermatitis Patients”, Acta Derm Venereol, vol. 95, no. 5, pp. 579–582, Jan. 2015.