Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) O.P. Schumacher and C. Peiper and M. Lörken and V. Schumpelick,Langzeitergebnisse der Nabelhernienreparation nach Spitzy,Der Chirurg,0009-4722,Springer Science and Business Media LLC,2003-01,74,1,50-54,https://cir.nii.ac.jp/crid/1362825896015246336,https://doi.org/10.1007/s00104-002-0536-z