Singapore was the first Commonwealth country to enact, in 1987, a presumed consent law for organ donation. Referred to as the Human Organ Transplant Act (HOTA), it applied only to persons between the ages of 21 and 60 years who had suffered accidental deaths certified by the criteria of brain death or cardiac death; who were non-Muslims; and who had not formally dissented from ("opted out of") organ donation. The actual policy was implemented in 1988, after a six-month period to allow objectors to register their dissent, and applied only to donation of kidneys.