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Theresa A. Meyers, Dezra J. Eichhorn, Cathie E. Guzzetta, Angela P. Clark, Jorie D. Klein, Ellen Taliaferro, Amy Calvin, CE Credit: Original Research: Family Presence during Invasive Procedures and Resuscitation, The American Journal of Nursing, Vol. 100, No. 2 (Feb., 2000), pp. 32-43
Meyers et al. (Tue,) studied this question.