39th International Winter-Workshop Clinical, Chemical and Biochemical Aspects of Pteridines and Related Topics Innsbruck, February 25th - 28th, 2020 - Gostner Johanna M.; Fuchs Dietmar; Felder Thomas; Griesmacher Andrea; Melichar Bohuslav; Postolache Teodor; Reibnegger Gilbert; Weiss Guenter; Werner Ernst R. (Pteridines, 2020)