Links:
[1] http://www.bcmj.org/pulsimeter/pulsimeter-10
[2] http://www.bcmj.org/letters/re-measuring-success-our-rehab-programs
[3] http://www.bcmj.org/letters/re-fragility-fracture-and-osteoporosis-investigation
[4] http://www.bcmj.org/letters/dubious-mercury-poisoning-results