404. That’s an error.

The requested URL /bookmarks/mark?op=add&bkmk=https%3A//gut.bmj.com/content/64/3/418&title=Placebo%20analgesia%20in%20patients%20with%20functional%20and%20organic%20abdominal%20pain%3A%20a%20fMRI%20study%20in%20IBS%2C%20UC%20and%20healthy%20volunteers was not found on this server. That’s all we know.