After the board of governors call Wednesday — which is expected to include one designated ownership representative of each team, sources said — two additional calls are set for Thursday for team presidents and general managers, sources said. So far, individual NBA teams have been hesitant to become the league’s first to voluntarily eliminate fans from home games, sources said. Even with the conference call set for governors and owners on Wednesday, there has been a tremendous amount of communication among teams, the league and public health experts in recent weeks.