1 Health Emergencies Programme, World Health Organization, 1211 Geneva, Switzerland.
2 Health Emergencies Programme, World Health Organization, 1211 Geneva, Switzerland; WHO Hub for Pandemic and Epidemic Intelligence, Berlin, Germany.
3 Health Emergencies Programme, World Health Organization, 1211 Geneva, Switzerland; WHO Lyon Office, Lyon, France.
4 Health Emergencies Programme, WHO Regional Office for the Eastern Mediterranean, Cairo, Egypt.
5 Bill & Melinda Gates Foundation, Seattle, WA, USA.
6 The Wellcome Trust, London, UK.
7 Health Emergencies Programme, WHO Regional Office for South-East Asia, New Delhi, India.
8 Health Emergencies Programme, WHO Regional Office for Africa, Brazzaville, Republic of the Congo.
9 Resolve to Save Lives, New York, NY, USA.
10 Health Emergencies Programme, WHO Regional Office for Europe, Copenhagen, Denmark.
11 Health Emergencies Programme, Pan American Health Organization, WHO Regional Office for the Americas, Washington, DC, USA.
12 Health Emergencies Programme, World Health Organization, 1211 Geneva, Switzerland; WHO Hub for Pandemic and Epidemic Intelligence, Berlin, Germany. Electronic address: cihekweazu@who.int.