title: Operational problems in vaccine trials.
mesh_terms: D001428:Bacterial Vaccines; D002648:Child; D002986:Clinical Trials as Topic; D003201:Computers; D004311:Double-Blind Method; D005260:Female; D006801:Humans; D007918:Leprosy / Q000517:prevention & control*; D008297:Male; D009166:Mycobacterium leprae / Q000276:immunology*; D011897:Random Allocation; D013223:Statistics as Topic; D014611:Vaccination
chemical_list: D001428:Bacterial Vaccines