Client List Osteopathic Physicians and Surgeons of Oregon Health Services and Providers David Walls David Walls 2121 SW Broadway Suite 115Portland, OR 97201 davidw@opso.orgPRIMARY: 503-705-3956503-241-4927 FAX: 503-433-1958 AssociationPreferred Contact MethodEmail Sabrina E. Riggs Sabrina E. Riggs Dalton Advocacy, Inc.417 2nd StreetLake Oswego, OR 97034 sabrina@daltonadvocacy.comPRIMARY: 503-990-2484 Independent