The buccal cells were collected using Copan FLOQSwabs (Copan Diagnostics, Inc., Murrieta, CA, USA) during post-surgery control. DNA was extracted using a GenElute Mammalian Genomic DNA Miniprep Kit (Sigma, Taufkirchen, Germany) in agreement with the manufacturer’s instructions. On a StepOne Real-Time Polymerase Chain Reaction (RT-PCR) instrument (Applied Biosystems, Bedford, MA, USA), all samples were genotyped in duplicate using the TaqMan® pre-designed SNP genotyping assays (C_176045196_10 for the COL22A1 rs11784270 and C_29400116_10 for the COL22A1 rs6577958, Applied Biosystems, Bedford, MA, USA) according to the protocol [12 (link)].
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