Predictive biomarkers of performance under stress: a two-phase study protocol to develop a wearable monitoring system by Cassandra Pattinson, Graham Kerr, Simon S Smith, Chamindie Punyadeera, Ian Stewart, Kerrie Mengersen, Karen A Sullivan, Jonathan M Flintoff, Sarah Ahamed, Shahnewaz Ali, Angus Bagley, Daniel Broszczak, Blair Crewther, Louis de Waal, Shannon L Edmed, Tharindu Fernando, Clinton Fookes, Francesca D Frentiu, Andrew P Hunt, Ottmar V Lipp, Ben McMaster, Luke Ney, Senn L Oon, Ajay Pandey, Parth Pandit, Jonathan M Peake, Muthukuttige Madusha Nuwanthi Perera, Virginie Perlo, Luke Schmidt, Kirsten Spann, Danielle Young, Tony J Parker