Advancing the cause of research registration: The first 500 registrations of the ResearchRegistry.com. (December 2016) - Agha, R.; Fowler, A.J.; Limb, C.; Al Omran, Y.; Sagoo, H.; Koshy, K.; Jafree, D.J.; Anwar, M.O.; McCulloch, Peter; Orgill, D.P.