Psychiatric care may be required following recovery. Magnesium replacement may also be required. Vehicles are often required to be registered. Export permits are still required, however. However, strict standards are not always required. Therefore, supplemental light would be required. New rail capacity would also be required. Therefore, it was required to be rather simple. At a minimum, 500 tons were required. Previously, such conversions were not required to be recognized. However, at times, manual intervention may be required. Portable ventilators may be required to support breathing. However, they were not required for the structure. A secure channel is not typically required. But, such action is not legally required.