Ann: Publication of Invex IIH Phase II Pressure Trial Results, page-16

"Patients with a diagnosis of active idiopathic intracranial hypertension were identified and recruited from a single tertiary referral hospital (University Hospitals Birmingham NHS Foundation Trust). "

You also need to recall that inter cranial pressure was measured differently in this trial. "ICP was recorded using a transdermal telemetric ICP monitoring system" essential this required an implant in to the skull. This is not a nothing and while this provided the most fantastic data it is a lot bigger deal than asking patients to undergo 3 or 4 lumber punctures over 6 months, which in and of itself is also not nothing.