Portuguese to English Medical Medical: Pharmaceuticals regulations for a new drug, Portugal

Here is the context:

"O comparador escolhido foi o seguimento padrão deste tipo de doentes na prática clínica portuguesa, de acordo com o estipulado nas OMEAEM"

This same acronym appears elsewhere as simply 'OMEAEM' and "EAEM'.

For 'EAEM', I assume the English equivalent to be:

Medicinal products economic evaluation study

But the addition of the extra 'O' or 'OM' has be baffled.

Any thoughts would be welcomed.