list_services: List of services with date of birth
In DavidPatShuiFong/dMeasureBillings: Billings module for dMeasure

Filtered by date, and chosen clinicians

list_services(
  dMeasureBillings_obj,
  date_from = NA,
  date_to = NA,
  clinicians = NA,
  internalID = NA,
  payerCode = NA,
  lazy = FALSE
)

`dMeasureBillings_obj`	dMeasureBillings R6 object
`date_from`	default is $date_a. start date, inclusive (date object)
`date_to`	default is $date_b end date, inclusive (date object)
`clinicians`	default is $clinicians. list of clinicians to view
`internalID`	default is NA (include all). vector of internal IDs to include (filter)
`payerCode`	default is $payerCode 0 = unknown 1 = private (patient) 2 = Medicare direct billing 'bulk-billing' 3 = Department of Veteran Affairs 'DVA' 4 = WorkCover 5 = private (head of family) 8 = private (other)
`lazy`	if lazy=TRUE, then don't re-calculate $appointments_filtered to calculate