Private Health is designed to backfill these gaps whenever one of its patients has a medical emergency or complex condition, say, a traumatic brain injury or newly diagnosed cancer.

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Ban called for the professional community and society as a whole to become more involved, compassionate and accepting of this complex condition and stressed the importance of early intervention for every child in the world who lives with autism.

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Tiffany White, from Gloucester, said there were poor hygiene standards at the hospital shortly before her son Oscar Wilcox died from a complex cardiac condition.

BBC: Rachael Puaca and Christopher Casey

But a week later, he said his condition was "more complex, " and he took a leave of absence.

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To get to your question, the antidepressant potential of ketamine was discovered serendipitously in patients receiving the drug for the treatment of complex regional pain syndrome, or CRPS, a miserable condition characterized by severe pain, swelling and changes in the skin.

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After several treatments he is now able to perform complex tasks such as brushing his hair, although with difficulty due to severe immobility caused by his condition.

BBC: The electrodes were placed at specific points in the brain