The mattress is so nice, a very good quality, really worth the money.
Such sources would include peer-reviewed medical and academic journals, medical and academic associations in good standing, and interviews with or blog posts from certified medical professionals.
We have been very happy with ours and just bought another for our vacation rental! Thanks and will repeat to buy or recommend to friends.
With no phone call all week I started calling on 10th.
Just a side note, pocket spring mattresses used to cost thousands of Ringgit.