Between Sept 19 , 2011 , and March 25 , 2013 , 329 patients were randomly assigned to a treatment group ( chloroquine plus tafenoquine 50 mg [ n = 55 ] , 100 mg [ n = 57 ] , 300 mg [ n = 57 ] , 600 mg [ n = 56 ] ; or to chloroquine plus primaquine [ n = 50 ] ; or chloroquine alone [ n = 54 ] ) .