Guidelines for reporting embedded recruitment trials by Madurasinghe, V, Eldridge, S, Bower, P, Hughes-Morley, A, Collier, D, Forbes, G, Graffy, J, Kennedy, A, Knapp, P, Rick, J, Salisbury, C, Small, N, Torgerson, D, Treweek, S, Montgomery, A, Dack, C, Shanahan, D, Reeves, D, Cook, J, Campbell, M, Brueton, V