iLOCi: a SNP interaction prioritization technique for detecting epistasis in genome-wide association studies by Piriyapongsa Jittima, Ngamphiw Chumpol, Intarapanich Apichart, Kulawonganunchai Supasak, Assawamakin Anunchai, Bootchai Chaiwat, Shaw Philip J, Tongsima Sissades