Inter- and intra-observer reliability and agreement of O2Pulse inflection during cardiopulmonary exercise testing: A comparison of subjective and novel objective methodology. - Nickolay, Thomas; McGregor, Gordon; Powell, Richard; Begg, Brian; Birkett, Stefan; Nichols, Simon; Ennis, Stuart; Banerjee, Prithwish; Shave, Rob; Metcalfe, James; Hoye, Angela; Ingle, Lee (PLoS ONE, 2024)