if (!participant.getXrefs().isEmpty()){ getWriter().write(MitabUtils.FIELD_SEPARATOR); Iterator<Xref> participantXrefIterator = participant.getXrefs().iterator(); while (participantXrefIterator.hasNext()) { Xref ref = participantXrefIterator.next(); else if (!participant.getXrefs().isEmpty()){ Iterator<Xref> participantXrefIterator = participant.getXrefs().iterator(); while (participantXrefIterator.hasNext()) { Xref ref = participantXrefIterator.next();