But he said that if no more cases arose, the drug might be able to return without extensive new clinical trials.

These prototypes were tested during extensive trials for three years between 1988 to 1991.

By late 2001, the system fired over 1,000 rounds, during extensive trials in Israel.

The conversion was followed by extensive trials and local training operations.

We want someone to back some more extensive trials to prove the real capabilities of our system.

The Board usually introduces significant rules change through extensive trial and a period of mandatory experiment.

A primary prototype was sent to Egypt where extensive trials were completed in late 1987.

After extensive trials, the 1219C2 prototype was recommended for adoption.

Hence, many suitable properties must be considered, with extensive clinical trials.

They were put to extensive trials; the war ended before they entered service.