[1] Department of Dermatology,
[2] University of Ulm,undefined
[3] 89081 Ulm,undefined
[4] Germany e-mail: gKraehn@aol.com,undefined
[5] Tel.: +49-731-5024885,undefined
[6] Fax: +49-731-5023771,undefined
[7] Department of Gastroenterology,undefined
[8] University of Ulm,undefined
[9] Ulm,undefined
[10] Germany,undefined