Effectiveness of a Dyadic Technology–Enhanced Home-Based Horticultural Therapy on Psychosocial Well-Being Among People With Dementia and Their Family Caregivers: Multimethods Pilot Study - Patrick Pui Kin Kor; Justina Yat Wa Liu; Arkers Kwan Ching Wong; Alex Pak Lik Tsang; Han Zhi Tan; Daphne Sze Ki Cheung; Humphrey Kwong Wai Leung; Frances Kam Yuet Wong (JMIR Aging)