Corrigendum to "Phytochemical and Antioxidant Studies on a Rare Rheum cordatum Losinsk: Species from Kazakhstan". (11th June 2020) - Zhumashova, Gulsim; Kukula-Koch, Wirginia; Koch, Wojciech; Baj, Tomasz; Sayakova, Galiya; Shukirbekova, Alma; Głowniak, Kazimierz; Sakipova, Zuriyadda