Table 2.

Variable measurement and source.

Potential Variables	Items	Questions	Source
Perceived usefulness of online health information	1	Online health information helps me validate doctors’ diagnosis	Tan S S et al. [6]
	2	Online health information helps me realize my own health status
Perceived usefulness of online doctors’ service	1	I receive caring and helping from doctors on the online health community.	Iverson S A et al. [5]; Oh, HJ et al. [14]
	2	Online doctors will offer me necessary information when I face disease-related problems.
Patient–physician interaction	1	Interacting with doctors makes me feel smooth.	Oh, HJ et al. [14]; Ford S et al. [41]; Wu T et al. [42]
	2	I will try to get practical information from doctors for my disease management.
	3	During my interaction with doctors, the doctors demonstrate sufficient devotion to the management of my problems.
	4	When I find some information regarding my disease, I will bring them to my doctor.
Patient–physician trust	1	I trust the doctors so much I always try to follow his/her advice.	Anderson L A et al. [43]
	2	My doctor is a real expert in taking care of medical problems like mine.
	3	If my doctor tells me something is so, then it must be true.
	4	I trust my doctor to put my medical needs above all other considerations when treating my medical problems.