public static bool HasPreferredLanguage(this StaffRole user) => user is IRequirePreferredLanguage;
public static bool HasNationalSociety(this StaffRole user) => user is IRequireNationalSociety;
public static bool HasPosition(this StaffRole user) => user is IRequirePosition;
public static bool HasLocation(this StaffRole user) => user is IRequireLocation;
public static bool HasDutyStation(this StaffRole user) => user is IRequireDutyStation;
public static bool HasBirthYear(this StaffRole user) => user is IRequireBirthYear || user is ISupportBirthYear;
public static bool HasAssignedNationalSocieties(this StaffRole user) => user is IRequireAssignedNationalSocieties;
public static bool HasPhoneNumbers(this StaffRole user) => user is IRequirePhoneNumbers || user is ISupportPhoneNumbers;