3. del Giudice MM, Brunese FP, Piacentini GL, et al. Fractional exhaled nitric oxide (FENO), lung function and airway hyperresponsiveness in naïve atopic asthmatic children. J Asthma 2004;41:759–765.
4. Wang Y, Li L, Han R, et al. Diagnostic value and influencing factors of fractional exhaled nitric oxide in suspected asthma patients. Int J Clin Exp Pathol 2015;8:5570–5576.
5. Keen C, Olin AC, Wennergren G, Gustafsson P. Small airway function, exhaled NO and airway hyper-responsiveness in paediatric asthma. Respir Med 2011;105:1476–1484.
6. Muñoz-López F, Ríos-Alcolea M. The interest of FEF(25-75) in evaluating bronchial hyperresponsiveness with the methacholine test. Allergol Immunopathol (Madr) 2012;40:352–356.
8. Ko HS, Chung SH, Choi YS, Choi SH, Rha YH. Relationship between exhaled nitric oxide and pulmonary function test in children with asthma. Korean J Pediatr 2008;51:181–187.
9. Kim SH, Yoon HJ. Use of the exhaled nitric oxide for management of asthma and respiratory diseases. Korean J Med 2008;74:579–586.
11. Ramser M, Hammer J, Amacher A, Trachsel D. The value of exhaled nitric oxide in predicting bronchial hyperresponsiveness in children. J Asthma 2008;45:191–195.
12. Porsbjerg C, Sverrild A, Backer V. Combining the mannitol test and FeNO in the assessment of poorly controlled asthma. J Allergy Clin Immunol Pract 2015;3:553–559.
15. Mattes J, Storm van's Gravesande K, Reining U, et al. NO in exhaled air is correlated with markers of eosinophilic airway inflammation in corticosteroid-dependent childhood asthma. Eur Respir J 1999;13:1391–1395.
17. Martin MJ, Wilson E, Gerrard-Tarpey W, et al. The utility of exhaled nitric oxide in patients with suspected asthma. Thorax 2016;71:562–564.
18. Smith AD, Cowan JO, Brassett KP, et al. Exhaled nitric oxide: a predictor of steroid response. Am J Respir Crit Care Med 2005;172:453–459.
19. Szefler SJ, Martin RJ, King TS, et al. Significant variability in response to inhaled corticosteroids for persistent asthma. J Allergy Clin Immunol 2002;109:410–418.
20. Choi BS, Jee HM, Park YH, Kim KW, Sohn MH, Kim KE. Relationship between exhaled nitric oxide concentration and pulmonary function/airway hyperresponsiveness in asthmatic children. Pediatr Allergy Respir Dis 2009;19:291–299.
21. Piacentini GL, Bodini A, Costella S, et al. Exhaled nitric oxide, serum ECP and airway responsiveness in mild asthmatic children. Eur Respir J 2000;15:839–843.
22. Backer V, Sverrild A, Porsbjerg C. FENO and AHR mannitol in patients referred to an out-of-hospital asthma clinic: a real-life study. J Asthma 2014;51:411–416.
23. Sverrild A, Porsbjerg C, Thomsen SF, Backer V. Airway hyperresponsiveness to mannitol and methacholine and exhaled nitric oxide: a random-sample population study. J Allergy Clin Immunol 2010;126:952–958.
24. Perzanowski MS, Yoo Y. Exhaled Nitric Oxide and Airway hyperresponsiveness to adenosine 5’-monophosphate and methacholine in children with asthma. Int Arch Allergy Immunol 2015;166:107–113.
25. Seo BS, Lee JM, Cho E, et al. Relationship between exhaled nitric oxide and small-airway dysfunction in children with asthma using spirometry and the impulse oscillometry system. Allergy Asthma Respir Dis 2015;3:267–271.
26. Martin MJ, Wilson E, Gerrard-Tarpey W, et al. The utility of exhaled nitric oxide in patients with suspected asthma. Thorax 2016;71:562–564.
27. Zietkowski Z, Bodzenta-Lukaszyk A, Tomasiak MM, Skiepko R, Szmitkowski M. Comparison of exhaled nitric oxide measurement with conventional tests in steroid-naive asthma patients. J Investig Allergol Clin Immunol 2006;16:239–246.
28. Sato S, Saito J, Sato Y, et al. Clinical usefulness of fractional exhaled nitric oxide for diagnosing prolonged cough. Respir Med 2008;102:1452–1459.
29. Smith AD, Cowan JO, Filsell S, et al. Diagnosing asthma: comparisons between exhaled nitric oxide measurements and conventional tests. Am J Respir Crit Care Med 2004;169:473–478.
30. Seo HS, Chung BH, Park HN, et al. Relationships between fraction of nitric oxide, airway hyperresponsiveness, blood eoshinophil counts and serum eosinophil cationic protein in asthmatic children. Pediatr Allergy Respir Dis 2012;22:282–291.