"Archived copy"(PDF). www.who.int. Archived from the original(PDF) on 13 September 2014. Retrieved 15 January 2022.{{cite web}}: CS1 maint: archived copy as title (link)
who.int
"Archived copy"(PDF). www.who.int. Archived from the original(PDF) on 13 September 2014. Retrieved 15 January 2022.{{cite web}}: CS1 maint: archived copy as title (link)