english: Randomized clinical trials are incredible tools, and, in fact, the US Food and Drug Administration often requires at least two to be conducted before a new drug can be marketed.
non_english: Nasumične kliničke studije  su neverovatni instrumenti, i zapravo, Administracija hrane i lekova SAD-a često zahteva bar dve ovakve studije pre nego što dozvoli da se novi lek izbaci na tržište.