In Canada if you are in need of a liver transplant they prefer you be sober for at least 6 months.
http://www.cbc.ca/news/canada/toronto/liver-transplant-ethics-should-alcoholics-be-sober-first-1.2934786?cmp=rss
http://www.cbc.ca/news/canada/toronto/liver-transplant-ethics-should-alcoholics-be-sober-first-1.2934786?cmp=rss