every six months

The researchers analyzed data on the language abilities of young children with cochlear implants prior to their implantation surgery and every six months after implantation.

I still meet with my gynecological oncologist and get my CA-125 levels tested and a vaginal ultrasound every six months.

It also saw check-ups move from every six months to 12.

Water that isn't commercially bottled should be replaced every six months to ensure its safety.

Pilots have to undergo medical exams every 12 months, while those aged over 40 have to renew their medical certificates every six months.