Response to Letter to the Editor regarding "Achieving comparability with IFCC reference method for the measurement of hemoglobin A1c by use of an improved isotope-dilution mass spectrometry method"
1 Chemical Metrology Laboratory, Applied Sciences Group, Health Science Authority, 1 Science Park Road, #01-05/06, The Capricorn, Singapore Science Park II, Singapore, 117528, Singapore.
2 Chemical Metrology Laboratory, Applied Sciences Group, Health Science Authority, 1 Science Park Road, #01-05/06, The Capricorn, Singapore Science Park II, Singapore, 117528, Singapore. LIU_Qinde@hsa.gov.sg.