A detailed description of the guideline harmonization process has been published:

Kremer LCM, Mulder RL, Oeffinger KC, Bhatia S,  Landier W, Levitt G, Constine LS, Wallace WH, Caron HN, Armenian SH, Skinner R and Hudson MM (2013), A worldwide collaboration to harmonize guidelines for the long-term follow-up of childhood and young adult cancer survivors: A report from the International Late Effects of Childhood Cancer Guideline Harmonization Group. Pediatr. Blood Cancer; 60: 543–549 doi: 10.1002/pbc.24445