Corrigendum: Platycodon grandifloras polysaccharides deeply participate in the anti-chronic bronchitis effects of platycodon grandiflorus decoction, a representative of “the lung and intestine are related” - Yang Liu; Qingqing Chen; Rongrong Ren; Qingqing Zhang; Guiming Yan; Dengke Yin; Dengke Yin; Mingyan Zhang; Ye Yang; Ye Yang; Ye Yang (Frontiers in Pharmacology)