Honestly speaking I wouldn't consider healthcare institutions as GLC, simply because they are not for profit! So stop lumping other GLCs (e.g. Singtel, GIC, Temasek, and Accenture etc.) together with the PHIs please. And do read the post by fearoftheunknown; she is absolutely right in stating the salary, perks, and motivation for joining the healthcare industry.

There were a few people that shared their insight of being in the healthcare institution; they are right as well. Generally administrators are not paid as handsomely, nor treated as "well" as the medical professionals (e.g. doctors, nurses, AHPs etc.). So if you do want to join as administrators (e.g. executives in operations, IT, corp comms, and HR etc.), please be prepared to:

1) Receive lower salary package when comparing to other public agencies (e.g. Ministries, Stat boards, organs of state etc.); and
2) Able to withstand the "hierarchy" of medical professionals vs non-medical professionals, on top of the usual career ladder hierarchy.

If after understanding all the "cons" of joining a healthcare institution in a non medical profession, and you are still interested to make a difference, by all means please join. I would say this is really not a job for those who wish to earn loads of money. Not unless you've reached at least the DD level, which typically takes about 20 years, and very limited for non-medical professions.