/// <summary> Aggregate number groups. </summary>
/// <remarks> Sander.struijk, 26.02.2014. </remarks>
/// <param name="countryCode"> The country code. </param>
/// <returns> The phone number. </returns>
private string AggregateNumberGroups(string countryCode)
{
return(NumberGroups.Aggregate(countryCode, (current, next) => string.Format("{0} {1}", current, next)));
}
