Valid country group codes for measures
| Code | WHO_EURO | EU_MEMBERS | EU_BEFORE_MAY2004 | EU_AFTER_MAY2004 | EU_BEFORE_FEB2020 | CIS | CARINFONET | SEEHN | NORDIC | SMALL | HBSC_MEMBER | EURO_SURVEIL | WESTERN_BALKANS | EASTERN_PARTNERSHIP | CENTRAL_ASIA | WESTERN_ASIA | EASTERN_EUROPE | NORTHERN_EUROPE | SOUTHERN_EUROPE | WESTERN_EUROPE |
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