Xanthohumol microbiome and signature in adults with Crohn's disease (the XMaS trial): a protocol for a phase II triple-masked, placebo-controlled clinical trial. - Langley, Blake O.; Ryan, Jennifer Joan; Phipps, John; Buttolph, Lita; Bray, Brenna; Aslan, Joseph E.; Metz, Thomas O.; Stevens, Jan F.; Bradley, Ryan (Trials, 2022)