Michael Sand1
, Daniel Sand2
, Pejman Boorboor3
, Benno Mann1
, Peter Altmeyer4
, Klaus Hoffmann4
and Falk G Bechara4 
1
Department of General and Visceral Surgery, Augusta Kranken Anstalt, Academic Teaching Hospital of the Ruhr-University Bochum, Germany
2
Department of Physiological Science, University of California Los Angeles (UCLA), Los Angeles, California, USA
3
Department of Plastic and Reconstructive Surgery, Hannover Medical School, Hannover, Germany
4
Department of Dermatology and Allergology, Ruhr-University Bochum, Germany