The Accelerating Access Initiative (AAI), begun in 2000, is a partnership between UNAIDS, the World Health Organization (WHO), the UN Children's Fund (UNICEF), the UN Population Fund (UNFPA), the World Bank and seven research-based pharmaceutical companies (Abbott, Boehringer Ingelheim, Bristol-Myers Squibb, Merck & Co., Inc., Roche, Tibotec (an affiliate of Johnson & Johnson) and ViiV Healthcare, which combines the HIV medicine operations of GlaxoSmithKline, Pfizer.