Table 3.

Detailed gray literature search strategy

Database	Terms
Health services research projects in progress	(((informatics OR internet OR consumer health information) AND (consumer OR patients OR parents OR caregivers) AND (randomized controlled trial OR clinical trial)) OR ((informatics OR internet OR consumer health information) AND (consumer OR patients OR parents OR caregivers) AND (access OR barrier OR facilitator OR compatibility OR user centered)))
IEEE CNF IEEE conference proceeding	((((((informatics or internet or consumer health information) and (consumer or patients or parents or caregivers) and (randomized controlled trial or clinical trial)) or ((informatics or internet or consumer health information) and (consumer or patients or parents or caregivers) and (access or barrier or facilitator or compatibility or user centered))))<in>metadata)) <and> (pyr>= 1990 <and> pyr <= 2009)
IET CNF IET conference proceeding
Proceedings of the American society for information science and technology (Wiley InterScience)	Informatics OR “health information” OR “consumer health information” OR internet
WHO-international clinical trials registry platform	Informatics applications OR consumer health information OR internet
American public health association (APHA)	Consumer health information OR health information OR consumer
2000–2008
OpenSIGLE—system for information on gray literature in Europe	(((informatics OR internet OR consumer health information) AND (consumer OR patients OR parents OR caregivers) AND (randomized controlled trial OR clinical trial)) OR ((informatics OR internet OR consumer health information) AND (consumer OR patients OR parents OR caregivers) AND (access OR barrier OR facilitator OR compatibility OR user centered)))
The New York academy of medicine—gray literature	Informatics OR “consumer health information” OR “health information application”