The Accuracy in Measurement of Blood Pressure (AIM‐BP) collaborative: background and rationale by Padwal, R, Campbell, NRC, Weber, MA, Lackland, D, Shimbo, D, Zhang, X-H, Schutte, AE, Rakotz, M, Wozniak, G, Townsend, R, McManus, R, Asayama, K, Picone, D, Cohen, J, Brady, T, Hecht-Olsen, M, Delles, C, Alpert, B, Dart, R, Dipette, DJ, Sharman, JE, Accuracy In Measurement Of Blood Pressure Collaborative