[1] Osped San Giovanni Bellinzona, Pediat Inst Southern Switzerland, Bellinzona, Switzerland
[2] Univ Lausanne, CHUV, Unite Romande Immunorhumatol Pediat, Lausanne, Switzerland
[3] Geneva Univ Hosp, Geneva, Switzerland
[4] Lausanne Univ Hosp, Pediat Cardiol Unit, Lausanne, Switzerland
[5] Osped Italiano Lugano, Ophtalmol Unit, Lugano, Switzerland
[6] Univ Lausanne, Fdn Asile Aveugles, Jules Gonin Eye Hosp, Dept Ophthalmol, Lausanne, Switzerland
[7] Univ Svizzera Italiana, Via Buffi 13, CH-6900 Lugano, Switzerland