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    • Factors influencing peak expiratory flow in teenage boys 

      Van Helden, S. N.; Hoal-van Helden, E. G.; Van Helden, P. D. (Health & Medical Publishing Group, 2001)
      Background. Peak expiratory flow (PEF) is a useful measure of pulmonary health status and is frequently utilised in asthma management. Reduction in PEF is usually indicative of onset of asthma symptoms. However, use can ...