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| Benefiting from the most efficient administrative personnel management necessitates an international organisation that incorporates specific national requirements. |
| - Austria - Belgium - Bulgaria - Croatia - Czech Republic - Denmark - Estonia - Finland - France - Germany - Greece | - Hungary - Ireland - Israel - Italy - Kazakhstan - Latvia - Lithuania - Luxembourg - Netherlands - Norway - Poland | - Portugal - Romania - Russia - Slovakia - Slovenia - Spain - South Africa - Sweden - Switzerland - Turkey - United Kingdom - Ukraine |