“…Five studies reported a definition of diarrhea (Bywater, 1977; Grimshaw et al ., 1987; Grandemange et al ., 2002; Sunderland et al ., 2003; Ollivett et al ., 2009); it was exclusively based on FCS but its description and score-point system highly varied across studies. Five studies used the term ‘diarrhea’ but provided no definition (Lofstedt et al ., 1996; White et al ., 1998; Fecteau et al ., 2003; Schnyder et al ., 2009; Silva et al ., 2010), and one study defined health events based on abnormal FCS without using the term ‘diarrhea’ (Sheldon, 1997). Two studies reported treatment failure and success (Sheldon, 1997; Grandemange et al ., 2002), but the term ‘failure’ was not defined in Sheldon (1997).…”