[1] CLAYTON HOSP, WAKEFIELD, ENGLAND
[2] PINDERFIELDS HOSP, WAKEFIELD, ENGLAND
[3] AIREDALE GEN HOSP, KEIGHLEY, ENGLAND
[4] HALIFAX GEN HOSP, HALIFAX, ENGLAND
[5] YORK DIST GEN HOSP, YORK, ENGLAND
[6] PONTEFRACT GEN HOSP, PONTEFRACT, ENGLAND
[7] UNIV DURHAM, DEPT ANTHROPOL, DURHAM DH1 3HP, ENGLAND
[8] UNIV LEEDS, DEPT COMMUNITY MED & GEN PRACTICE, LEEDS LS2 9JT, W YORKSHIRE, ENGLAND