Clifford Chan-Yan is a clinical professor emeritus at the University of British Columbia, Canada. He received his medical degree from the University of Cape Town and a specialty in internal medicine from the College of Physicians of South Africa and the Royal College of Physicians of Canada. He is a former examiner for the Royal College's final clinical examinations. As a clinical instructor with an interest in physical examination, he endeavors to teach this practical skill to others. Eldon Underhill is a visual artist with more than thirty-five years of experience in graphic art, design, and illustration. During his twenty-year graphic design career at St. Paul's Hospital in Vancouver, Canada, he worked with physicians and other health professionals to develop a wide variety of materials related to both patient education and professional communication. He graduated from the former Vancouver School of Art (now Emily Carr University of Art and Design) in 1977. He maintains both a graphic design and fine art (painting and photography) practice at his home in Halfmoon Bay, Canada.