Battling your way past rebel and government soldiers to buy medical supplies does not fall under a nurse's usual job description. But for Sister Rosalia, trying to treat the sick in the northern half of Cote d'Ivoire, it is an unavoidable chore. The world's top cocoa producer has been split in two since an uprising in September 2002 and aid workers and residents say the humanitarian situation is deteriorating in the rebel-held north of the country.