Zaleca się wykonywać je co 12–18 mi

Zaleca się wykonywać je co 12–18 miesięcy, a przy braku zmian w ciągu 10 lat obserwacji, co dwa lata

Results (English) 1:

It is recommended that you perform them every 12-18 months, and in the absence of changes in 10 years of observation, every two years

Results (English) 2:

It is recommended to do them every 12-18 months, and in the absence of changes in the 10 years of observation, every two years

Results (English) 3:

it is recommended to perform every 12-18 months, and in the absence of changes in 10 years observation, every two years