Verdenssundhedsorganisationen (WHO) og Den Europæiske Komité for Elektroteknisk Standardisering (CENELEC) støtter allerede et flerårigt polycentrisk forskningsprojekt for at få endelig klarhed over disse spørgsmål.
The World Health Organization (WHO) and the European Committee for Electro-technical Standardisation (CENELEC) have already sponsored multiannual multicentre study programmes to clarify these issues conclusively.