Sejbaek, C S, Flachs, E M, Carøe, T K, Meyer, H W, Frederiksen, M, Frydendall, K B, Wolkoff, P, Clausen, P A, Hougaard, K S & Schlünssen, V 2022, ' Professional cleaning and risk of asthma-a Danish nationwide register-based study ', Scandinavian Journal of Work, Environment & Health, vol. 48, no. 2, 3997, pp. 127-136 . https://doi.org/10.5271/sjweh.3997 Sejbaek, C S, Flachs, E M, Caroe, T K, Meyer, H W, Frederiksen, M, Frydendall, K B, Wolkoff, P, Clausen, P A, Hougaard, K S & Schlunssen, V 2022, ' Professional cleaning and risk of asthma-a Danish nationwide register-based study ', Scandinavian journal of work, environment & health, vol. 48, no. 2, pp. 127-136 . https://doi.org/10.5271/sjweh.3997