public <T, Loc> int getUseCount(final Key<? extends Statistician<T, Loc>> key, final T element, final Loc location) {
    final StatisticsInfo info = serialize(key, element, location);
    return info == null ? 0 : getUseCount(info);
  }
public <T, Loc> int getUseCount(final Key<? extends Statistician<T, Loc>> key, final T element, final Loc location)