Olerud JE, Pecoraro RE, Burgess EM, McKnight B, Wyss CR, Reiber GE, Matsen FA 3rd. Reliability of transcutaneous oxygen tension (TcPO2) measurements in elderly normal subjects. Scand J Clin Lab Invest. 1987 Oct;47(6):535-41.
Olerud JE, Pecoraro RE, Burgess EM, McKnight B, Wyss CR, Reiber GE, Matsen FA 3rd. Reliability of transcutaneous oxygen tension (TcPO2) measurements in elderly normal subjects. Scand J Clin Lab Invest. 1987 Oct;47(6):535-41.