His successor this week sent a party of negotiators to the area, but delayed sending a technical team because of the rebels' failure to sign the accord.
Inflammation and fibrosis - scarring - of the liver tissue, which affects about 10% of the UK population, can cause cirrhosis or liver failure and lead to cancer if diagnosis is delayed or if left untreated.
Two other bank bosses have waived their bonuses this year follow scandals: Antony Jenkins following Barclays' admission of its involvement in rigging the multi-trillion-dollar Libor interest rate and Royal Bank of Scotland's Stephen Hester after a massive computer failure caused payments into customers' accounts to be delayed by several days.