This function is used to extract the ADNI study protocol order number.
See also
Other ADNI study protocol/phase:
adni_phase(),
adni_pttype(),
adni_study_track(),
convert_adni_phase_order_num(),
create_col_protocol(),
create_orig_protocol(),
original_study_protocol()
Examples
if (FALSE) { # \dontrun{
adni_phase_order_num(phase = c("ADNI1", "ADNI3", "ADNI4", "ADNIGO"))
} # }
