We conducted a prospective , double-blind , randomized clinical trial , comparing late coagulopathy in snakebitten patients treated with F ( ab ' ) @ with maintenance doses -LSB- F ( ab ' ) @/F ( ab ' ) @ -RSB- , or F ( ab ' ) @ with placebo maintenance doses -LSB- F ( ab ' ) @/placebo -RSB- , versus Fab with maintenance doses -LSB- Fab/Fab -RSB- .