The 55 week interval represents the longest time that any patient remained in the trial.

Patients received the challenge or placebo for five days with a two week interval between.

The laser treatment can be done in 6 week intervals.

These workshops are held in London at approximately six week intervals.

The Silsam robbery had been one of a chain, always with those three week intervals.

The first old bird race is usually about the middle of April, the rest following at two week intervals.

They'll drive themselves mad, trying to understand a three week interval.

The injectable formulation is being developed to be administered at four week intervals.

Fractions are available in five and seven week intervals.

Females went through estrous at 3 week intervals and could mate throughout the year.