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To my wife, Mary,<br />

and my children, Jean,<br />

Carolyn, and John<br />

Special thanks are extended to Professor Chad Cross,<br />

of the School of Public Health at the University of Nevada,<br />

Las Vegas, for his many contributions to this edition.<br />

He has introduced numerous new topics and explanatory comments<br />

that have broadened greatly the scope of the book.

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