[1] Department of Pediatrics,
[2] University Hospital Lund,undefined
[3] Sweden,undefined
[4] Department of Medicine,undefined
[5] University Hospital Lund,undefined
[6] 221 85 Lund,undefined
[7] Sweden e-mail: Ole.Torffvit@med.lu.se Tel.: +46-46-2220702,undefined
[8] Fax: +46-46-2110908,undefined
[9] Department of Clinical Biochemistry,undefined
[10] Viborg-Kjellerup County Hospital,undefined
[11] Denmark,undefined
[12] Department of Clinical Biochemistry,undefined
[13] AKH Aarhus University Hospital,undefined
[14] Denmark,undefined