Protocol for the development of a salutogenic intrapartum core outcome set (SIPCOS) Smith, Valerie, Daly, Deirdre, Lundgren, Ingela, Eri, Tine Schauer, Begley, Cecily, Gross, Mechthild M., Downe, Soo, Alfirevic, Zarko, Devane, Declan (2017-04-19)