[1] “Salvatore Maugeri” Foundation,
[2] IRCCS,undefined
[3] Rehabilitation Institute of Veruno,undefined
[4] Division of Pulmonary Disease,undefined
[5] Via per Revislate n.13,undefined
[6] I-28 010 Veruno (NO),undefined
[7] Italy e-mail: lappendini@fsm.it Tel. + 39 (03 22) 88 47 11 Fax + 39 (03 22) 83 02 94,undefined