@misc{indiciae2e0cfae9f113, title = {Postanal sinus: single or different etiologies?}, author = {A E Ponson and C Festen}, year = {2001}, doi = {10.1007/s003830000453}, url = {https://pubmed.ncbi.nlm.nih.gov/11294268/}, note = {Source identifier: 11294268} }