E. Neufeld, J. Muenzer, C. Scriver, A. Beaudet, W. Sly et al., The mucopolysaccharidoses, The Metabolic and Molecular Bases of Inherited Disease, pp.3421-52, 2001.

J. Wraith, M. Scarpa, M. Beck, O. Bodamer, D. Meirleir et al., Mucopolysaccharidosis type II (Hunter syndrome): a clinical review and recommendations for treatment in the era of enzyme replacement therapy, European Journal of Pediatrics, vol.7, issue.3
DOI : 10.1007/s00431-007-0635-4

I. Young, P. Harper, R. Newcombe, and I. Archer, A clinical and genetic study of Hunter's syndrome. 2 Differences between the mild and severe forms, Journal of Medical Genetics, vol.19, issue.6, pp.408-419, 1982.
DOI : 10.1136/jmg.19.6.408

M. Raluy-callado, W. Chen, D. Whiteman, J. Fang, and I. Wiklund, The impact of Hunter syndrome (mucopolysaccharidosis type II) on health-related quality of life, Orphanet Journal of Rare Diseases, vol.8, issue.1, p.101, 2013.
DOI : 10.1186/1750-1172-6-72

J. Muenzer, J. Wraith, M. Beck, R. Giugliani, P. Harmatz et al., A phase II/III clinical study of enzyme replacement therapy with idursulfase in mucopolysaccharidosis II (Hunter syndrome), Genetics in Medicine, vol.25, issue.8, pp.465-73, 2006.
DOI : 10.1097/01.gim.0000232477.37660.fb

J. Muenzer, O. Bodamer, B. Burton, L. Clarke, G. Frenking et al., The role of enzyme replacement therapy in severe Hunter syndrome???an expert panel consensus, European Journal of Pediatrics, vol.19, issue.1, pp.181-189, 2012.
DOI : 10.1007/s00431-011-1606-3

R. Giugliani, W. Hwu, A. Tylki-szymanska, D. Whiteman, and A. Pano, A multicenter, open-label study evaluating safety and clinical outcomes in children (1.4???7.5 years) with Hunter syndrome receiving idursulfase enzyme replacement therapy, Genetics in Medicine, vol.38, issue.6, pp.435-476, 2014.
DOI : 10.1007/BF00973157

J. Muenzer, M. Beck, R. Giugliani, Y. Suzuki, A. Tylki-szymanska et al., Idursulfase treatment of Hunter syndrome in children younger than 6 years: Results from the Hunter Outcome Survey, Genetics in Medicine, vol.51, issue.2, pp.102-111, 2011.
DOI : 10.1097/GIM.0b013e318206786f

C. Alcalde-martin, J. Muro-tudelilla, R. Cancho-candela, L. Gutierrez-solana, G. Pintos-morell et al., First experience of enzyme replacement therapy with idursulfase in Spanish patients with Hunter syndrome under 5 years of age: Case observations from the Hunter Outcome Survey (HOS), European Journal of Medical Genetics, vol.53, issue.6, pp.371-378, 2010.
DOI : 10.1016/j.ejmg.2010.07.013

A. Tylki-szymanska, A. Jurecka, Z. Zuber, A. Rozdzynska, J. Marucha et al., Enzyme replacement therapy for mucopolysaccharidosis II from 3???months of age: a 3-year follow-up, Acta Paediatrica, vol.77, issue.1, pp.42-49, 2012.
DOI : 10.1111/j.1651-2227.2011.02385.x

N. Guelbert, H. Amartino, C. Arberas, N. Azar, L. Bay et al., Guideline for diagnosis, follow-up and treatment of mucopolysaccharidoses type II or Hunter disease, Arch Argent Pediatr, vol.109, pp.175-81, 2011.

J. Muenzer, M. Beck, C. Eng, M. Escolar, R. Giugliani et al., Multidisciplinary Management of Hunter Syndrome, PEDIATRICS, vol.124, issue.6, pp.1228-1267, 2009.
DOI : 10.1542/peds.2008-0999

K. Group, T. The, and K. Questionnaires, Quality of life questionnaires for children and adolescents, 2006.

U. Ravens-sieberer, P. Auquier, M. Erhart, A. Gosch, L. Rajmil et al., The KIDSCREEN-27 quality of life measure for children and adolescents: psychometric results from a cross-cultural survey in 13 European countries, Quality of Life Research, vol.50, issue.8, pp.1347-56, 2007.
DOI : 10.1007/s11136-007-9240-2

U. Ravens-sieberer, A. Gosch, L. Rajmil, M. Erhart, J. Bruil et al., KIDSCREEN-52 quality-of-life measure for children and adolescents, Expert Review of Pharmacoeconomics & Outcomes Research, vol.5, issue.3, pp.353-64, 2005.
DOI : 10.1586/14737167.5.3.353

R. Martin, M. Beck, C. Eng, R. Giugliani, P. Harmatz et al., Recognition and Diagnosis of Mucopolysaccharidosis II (Hunter Syndrome), PEDIATRICS, vol.121, issue.2, pp.377-86, 2008.
DOI : 10.1542/peds.2007-1350

M. Scarpa, Z. Almassy, M. Beck, O. Bodamer, I. Bruce et al., Mucopolysaccharidosis type II: European recommendations for the diagnosis and multidisciplinary management of a rare disease, Orphanet Journal of Rare Diseases, vol.6, issue.1, p.72, 2011.
DOI : 10.1136/hrt.2005.063818

A. Keilmann, T. Nakarat, I. Bruce, D. Molter, and G. Malm, Hearing loss in patients with mucopolysaccharidosis II: Data from HOS ??? the Hunter Outcome Survey, Journal of Inherited Metabolic Disease, vol.25, issue.2, pp.343-53, 2012.
DOI : 10.1007/s10545-011-9378-5

J. Peck, Hearing Loss in Hunter??s Syndrome-Mucopolysaccnaridosis II, Ear and Hearing, vol.5, issue.4, pp.243-249, 1984.
DOI : 10.1097/00003446-198407000-00009