Protocol for the air purification for eosinophilic COPD study (APECS): a randomised controlled trial of home air filtration by HEPA by Mary B Rice, Petros Koutrakis, Brent A Coull, Wanda Phipatanakul, Kimberly F Greco, Ilona Jaspers, Meghan E Rebuli, Muhammad S Saeed, Cailey M Denoncourt, Isabella A Chao, Sophia Schortmann, Nicholas J Nassikas, Andrew J Synn, Choong-Min Kang, Jack M Wolfson, Stephen T Ferguson, Jessica P Liu

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