Association of ACTN3 R577X but not ACE I/D gene variants with elite rugby union player status and playing position

S M Heffernan, L P Kilduff, R M Erskine, S H Day, J S McPhee, Gerard Mc Mahon, G K Stebbings, J P H Neale, S J Lockey, W J Ribbans, C J Cook, B Vance, S M Raleigh, C Roberts, M A Bennett, G Wang, M Collins, Y P Pitsiladis, A G Williams