Evaluation of the risk factors of pilonidal sinus: A single center experience - BOLANDPARVAZ, Shahram; MOGHADAM DIZAJ, Parisa; SALAHI, Roohollah; PAYDAR, Shahram; BANANZADEH, Mohammad; ABBASI, Hamid-Reza; ESHRAGHIAN, Armaghan (Turkish Journal of Gastroenterology, 2012)