Response to Michiel Alexander de Raaf et al

Qifeng Yang¹, Chi Hou^1,2, Kai Yang¹+2

• ¹State Key Laboratory of Respiratory Disease, National Clinical Research Center for Respiratory Disease, Guangdong Key Laboratory of Vascular Disease, Guangzhou Institute of Respiratory Health, The First Affiliated Hospital of Guangzhou Medical University, Guangzhou, Guangdong, China.+3