Table 1.

Constructs and questionnaire items

Intention to Use (IU) [28]	IU1—If the Back-UP system would be available for me, I would definitely use it IU2—I would recommend the Back-UP system to others IU3—I hope that Back-UP becomes available to me
Perceived Usefulness (PU) [20]	PU1—Using the Back-UP system will help me to treat patients with back pain more efficiently PU2 -Using the Back-UP system will improve the quality of care that I will provide to patient with back pain PU3—Using the Back-UP system will ease the way in which I treat patient with back pain PU4—Using the Back-UP system will make my work more effective
Perceived Service Benefits (PSB) [24]	PSB1—Using the Back-UP system will improve the timeliness of patient care PSB2—Using the Back-UP system will reduce patient care and service costs PSB3—Using the Back-UP system will improve the service productivity of medical staff PSB4—Using the Back-UP system will reduce unnecessary patient transfers or admissions PSB5—Using the Back-UP system will improve overall effectiveness of patient care
Perceived Service Risks (PSR) [24]	PSR1—Using the Back-UP system will hinder physician – patient relationship PSR2—Using the Back-UP system will reduce patient care effectiveness PSR3—Using the Back-UP system will jeopardize patient privacy PSR4—Using the Back-UP system will bring psychological harm
Perceived Threat to professional Autonomy (PTA) [23]	PTA1—Using the Back-UP system will decrease my control over clinical decisions PTA2—Using the Back-UP system will decrease my professional discretion over patient care decisions PTA3—Using the Back-UP system will decrease my control over each step of the patient care process PTA4—Using the Back-UP system will increase monitoring of my diagnostic and therapeutic decisions by non-providers PTA5—Using the Back-UP system will decrease my control over the allocation of scarce resources PTA6—I find the Back-UP system advantageous for the medical profession as a whole
Benevolence (BEN) [27]	BEN1—I believe that the Back-UP system would act in my best interest BEN2—The Back-UP system is designed to help me
Integrity (INT) [27]	INT1—The Back-UP system will be honest in its advice INT2 -The advice the Back-UP system gives me is sincere
Competence (COMP) [27]	COMP1—The Back-UP system is competent and effective is providing advice COMP2—Overall, the Back-UP system is a capable and proficient advice provider