To do reliable research on any condition, scientists must agree on the specific characteristics that make up that condition so they're all talking about the same thing, and with PMS, this has not been the case.
Kako bi proveli pouzdano  istraživanje bilo kojeg stanja, znanstvenici se moraju složiti  oko specifičnih karakteristika koje uzrokuju to stanje tako da svi govore o istoj stvari a kod PMS-a to nije bio slučaj.