1. Department of Oncology and Pathology, Queen's University, Kingston, Ontario, Canada K7L 3N6
2. Department of Chemistry and Chemical Engineering, The Royal Military College of Canada, Kingston, Ontario, Canada K7K 5LO
3. Porphyrin Products, Inc., P.O. Box 31, 195 South 700 West, Logan UT 84321, USA
4. Department of Urology, Queen's University, Kingston, Ontario, Canada K6L 3N6