The phrase "a combination of visiting" is correct and usable in written English.
It can be used when describing an activity that involves multiple visits or a mix of different types of visits.
Example: "The itinerary includes a combination of visiting historical sites, museums, and local markets."
Alternatives: "a mix of visits" or "a blend of visiting".
While I try to visit the West Bank at least once a week, and usually do my best to follow domestic affairs with a keen interest, last week I morphed temporarily into the epitome of Bu'ah beach bum; a combination of friends visiting from abroad and cloudless skies suspending my usual routine.
With Giroud similarly off target after meeting a cute lob from the generally disappointing Alexis Sánchez, Sunderland found themselves reprieved by a combination of poor visiting final balls and the rewards of all that chasing and closing down on the part of Cattermole and company.
9 Such successful programmes have involved a combination of staff and visiting exercise specialists.
In comparison to the programme with home visits only, women were less willing to participate in a programme with a combination of home visits and telephone consultations; however, people with concerns about falls preferred this format.
REACH II uses a combination of home visits and telephone coaching to develop a more individualized approach to the problems faced by dementia family caregivers who are in significant distress.
It aims to strengthen the quality of caregiver-child interactions, build resilience among vulnerable children, and improve a variety of developmental outcomes through a combination of home visits, based on International Child Development Program and More Intelligent Sensitive Child (MISC) principles, video coaching, and individualized text messaging.
Most home-based programs used a combination of home visits and telephone calls to supervise participants.
In a study of staffed FCC networks in Chicago, Bromer et al. (2009) found that providers who were affiliated with a network that offered a combination of home visits, training, and support delivered by a network coordinator with specialized training offered higher quality care than unaffiliated providers.
Participants were followed up for 12 weeks from randomisation with a combination of home visits, telephone calls, and clinic attendance.
The preference rates for the other formats hardly varied, i.e. they ranged between 17% for the group-based programme and 19% for the programme with a combination of home visits and telephone consultations.
