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Peer interaction paradigm timeline of events. The 20-min paradigm consists of four 5-min periods of free play (T1), solicited play with equipment (T2), free, unsolicited play (T3), and solicited cooperative play with toys (T4). Salivary cortisol measures were taken at baseline (S1), immediately after the paradigm (S2), 20-min after the paradigm (S3), and 40-min after (S4).
