By Haas Walter   Straetemans M.   Pfaff G.   Nicoll A.   in Bundesgesundheitsblatt - Gesundheitsforschung - Gesundheitsschutz

ISSN:1436-9990|52|2|193-202

Springer Publishing Company ‎(2009)‎

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By Straetemans M.   Palmu A.   Auranen K.   Zielhuis G.A.   Kilpi T.   in International Journal of Pediatric Otorhinolaryngology

ISSN:0165-5876|67|11|1235-1242

Elsevier‎(2003)‎

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