BMP2 and Barrett esophagus: Although higher concentrations of BMP4 [OR = 1.11 (95% CI 0.86–1.43; p value = 0.44)] and BMP2 [OR = 1.34 (95% CI 0.98–1.87; p value = 0.07)] were observed in association with risk of having BE as well, these associations were not significant.