The OSOT is no longer available from the publisher:
Publisher address: Nelson, A Thomson Company, 1120 Birchmount Road,
Toronto, Ontario M1K 5G4, Canada
Telephone: 416-752-9448 or 1 800 268-2222
Fax: 416-752-8101 or 1 800 430-4445
If you have or suspect you have a medical problem, promptly contact your professional healthcare provider.