There is more to the story.
Riddle
Mark S
MS
D019072:Antibiotic Prophylaxis / Q000191:economics; D017281:Cost of Illness; D003906:Developing Countries; D003967:Diarrhea / Q000191:economics* / Q000453:epidemiology* / Q000517:prevention & control; D014943:Global Health; D017048:Health Care Costs / Q000706:statistics & numerical data*; D006266:Health Education / Q000191:economics; D007722:Health Knowledge, Attitudes, Practice; D006801:Humans; D011322:Primary Prevention / Q000191:economics*; D014195:Travel