* @return The ISO 3166-1 alpha-3 country code string associated with the @c countryCode, @n
* else an empty string if countryCode is invalid
* @see CountryCodeToString()
* @return The ISO 3166-1 alpha-3 country code string associated with the @c countryCode, @n
* else an empty string if countryCode is invalid
* @see CountryCodeToString()