TY - EJOUR T1 - Reference Values and Analytical Performance of the Hydroxyproline/Creatinine Ratio in Early Morning Urine Samples AU - Posma, F. D. AU - Groenewold, H. AU - Kluft, O. AU - Tuynman, F. H. B. PY - 1981 LA - und PB - Kooperation de Gruyter JO - Clinical Chemistry and Laboratory Medicine DO - 10.1515/cclm.1981.19.4.209 ER -