tidsperiod

Ytterligare några icke anmälda fall som diagnostiserats under samma tidsperiod inkluderades .

Additional non-notified cases diagnosed during the same period of time were included.

Strömmarna genom Öresund varierar således stort , inte bara under året utan också under längre tidsperioder .

The currents through Öresund thus vary greatly , not only during the year but also for longer periods of time .