Health – if you have the article point to it. I highly doubt that there is such an article that discusses the dynamics of Hatzoloh for many reasons.
1) there are no other volunteer ALS agencies.
2) most volunteer agencies have 18 year olds or 70 year olds on the active roster. Hatzolah has middle aged people, many of them having a lot of years of experience.
3) Unlike the majority of volunteer BLS agencies, Hatzolah has a robust system with many of its members that are otherwise involved in the medical industry, including working for other EMS agencies as paid personnel, nurses, PAs and even doctors.