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Maria E. Barrera, PhD, is Director of the Infant–Parent Program at McMaster University and Chedoke-McMaster Hospitals, Hamilton, Ontario, Canada. (Mailing address: M. E. Barrera, Infant–Parent Program, Chedoke Hospital Division, Bruce Bldg. #2, Box 2000–Station A, Hamilton, Ontario, Canada, L8N 3Z5)
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Dianne M. Vella, at the time of this study, was an undergraduate student at McMaster University, Hamilton, Ontario, Canada