public static QuantCvTermReference getIsotopeLabellingMethodParam(String accession) {

        if (ITRAQ_QUANTIFIED.getAccession().equals(accession)) {
            return ITRAQ_QUANTIFIED;
        } else if (TMT_QUANTIFIED.getAccession().equals(accession)) {
            return TMT_QUANTIFIED;
        } else if (O18_QUANTIFIED.getAccession().equals(accession)) {
            return O18_QUANTIFIED;
        } else if (AQUA_QUANTIFIED.getAccession().equals(accession)) {
            return AQUA_QUANTIFIED;
        } else if (ICAT_QUANTIFIED.getAccession().equals(accession)) {
            return ICAT_QUANTIFIED;
        } else if (ICPL_QUANTIFIED.getAccession().equals(accession)) {
            return ICPL_QUANTIFIED;
        } else if (SILAC_QUANTIFIED.getAccession().equals(accession)) {
            return SILAC_QUANTIFIED;
        }
        return null;
    }