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Borrego, L. M., Stocks, J., Almeida, I., Stanojevic, S., Antunes, J., Leiria-Pinto, P., Rosado-Pinto, J. E., & Hoo, A. (2013). bronchodilator responsiveness using spirometry in healthy and asthmatic preschool children. Archives of disease in childhood, 98(2), 112–117. http://access.bl.uk/ark:/81055/vdc_100137783551.0x000054