Externalization of saw-tooth architecture in small serrated polyps implies the presence of methylation of IGFBP7

Eisuke Kaji, Hideyuki Suzuki, Toshio Uraoka, Takehiro Tanaka, Jun Kato, Mitsuhiro Akita, Nobuya Ohara, Sakiko Hiraoka, Shunsuke Saito, Kazuhide Yamamoto