Activate extra survey URL only when EXTRA_SURVEY defined.
Activate extra survey URL only when EXTRA_SURVEY defined.

ISIFoundation/influenzanet-website,ISIFoundation/influenzanet-website,ISIFoundation/influenzanet-website,ISIFoundation/influenzanet-website,ISIFoundation/influenzanet-website,ISIFoundation/influenzanet-website,ISIFoundation/influenzanet-website