User:Jukiko/sandbox

Improved citations for holoendemic article:
 * 1) https://www.ncbi.nlm.nih.gov/mesh?term=Endemic+Diseases
 * 2) Remove, redundant
 * 3) Need a non-primary source that explains connection between holoendemic disease and adaptive immunity
 * 4) Need a non-primary source about holoendemic pattern of malaria in Africa
 * 5) Remove, irrelevant; replace with non-primary source about trachoma in Saudi Arabia