Has anyone ever used any of the tests available on Amazon? How do they compare to the more popular Genova Diagnostics Cortisol Saliva Test? If you advise against the Amazon kits, which would you recommend (other than Genova)? Ideally I need a kit I can order on my own, without my doc being involved. http://www.amazon.com/24-hour-Diurn...33293635&sr=8-4&keywords=cortisol saliva test Thanks!