Dr. Sadhish K. Siva — a radiologist who was certified by the American Board of Radiology after ABR stopped issuing lifetime certifications in 2002 and switched to a system that required him to separately pay for a 10-year certificate and ABR’s “maintenance of certification,” or MOC, program — sued the board for allegedly violating Section 1 of the Sherman Antitrust Act by “tying” its MOC services to the certification.Section 1 prohibits “every contract, combination … , …