Assessing pain in non-intubated critically ill patients unable to self report: an adaptation of the Behavioral Pain Scale - Chanques, Gérald; Payen, Jean-François; Mercier, Grégoire; De Lattre, Sylvie; Viel, Eric; Jung, Boris; Cissé, Moussa; Lefrant, Jean-Yves; Jaber, Samir (Intensive Care Medicine, 2009)