“…The systematic search yielded 199 unique items; 39 were considered eligible after screening of the title and abstract. Thirty-two publications were excluded: 29 were published as conference proceedings, one article was an opinion paper [ 10 ], one article was a survey among CF center directors that did not report individual data [ 11 ] and one article [ 12 ] reported preintervention and postintervention values of growth parameters after a project to improve BF in CF, but it did not show a comparison between breastfed and formula-fed infants. Thus, seven studies were identified by the systematic search [ 13 , 14 , 15 , 16 , 17 , 18 , 19 ], and two studies were identified by the manual search [ 20 , 21 ].…”