Top referee Patrick Ittrich, who is one of four Bundesliga officials out injured, has calling on the German Football Federation to limit the physical strain on referees. “Unlike the players, we don’t train with a team. I stand alone on the pitch. In the event that something happens to me, I have to build up a network, organize a doctor and a physio,” Ittrich, who also works as a police officer, said in an interview with web.de on Tuesday. “A lot of players have already complained about the problem of playing so many games. This is also the case for referees.” Ittrich, 45, is out of action due …