Mail campaign. For psychiatric referrals.
D002140:California; D002391:Catchment Area, Health; D006744:Hospital Bed Capacity, 100 to 299; D006801:Humans; D008389:Marketing of Health Services / Q000379:methods*; D011567:Psychiatric Department, Hospital / Q000706:statistics & numerical data*; D012017:Referral and Consultation / Q000639:trends*