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Then there are extreme weather events supercharged by climate change that can inflict immediate, wide-spread damage.

Ms Stirling, the founder and chief executive of Detained in Dubai, which helps foreigners abroad and is an international authority on UAE law, said Mr Fakana and his parents were "extremely distressed" by the events.

Though some patients experienced mild and transient side effects such as nausea, dizziness and daytime sleepiness, there were no serious adverse events and no rebound in symptom severity after the drug wore off.

He was now suffering from anterograde amnesia, remembering all the events before the surgery but unable to form new memories.

For example, recipients saw improvements in how far they could walk in six minutes, as well as substantial decreases in a biological indictor used to measure inflammation and predict risk of serious cardiovascular events.