Our office has a state-of-the art infusion area where patients receive the newest, most effective treatments for rheumatoid arthritis, osteoporosis and other autoimmune diseases. ... SEAFORD, DE. 1350 Middleford Road Suite 502 Seaford, DE 19973. Phone: +1 (302) 628 8300 Fax: +1 (302) 628 8400..