Echinacea purpurea: An overview of mechanism, efficacy, and safety in pediatric upper respiratory infections and otitis media by Thi-Mai-Hoa Vu, Thi-Van Hoang, Thi-Quynh-Huong Nguyen, Pham-Minh-Khue Doan, Thi-Thuy-Duong Nguyen, Thi-Thu-Thuy Bui, Chi-Cong Nguyen, Hong-Duyen Tran, Thi-Phuong-Thao Pham, Hai-Anh Ha

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