_sforceService.query("SELECT Patient_ID__c, Id FROM Contact WHERE FirstName = '" + contactToCheckAgainst.FirstName + "' AND LastName = '" + contactToCheckAgainst.LastName + "' AND Birthdate = " + sqlFormattedDate + " AND Mailing_Postal_Code__c = '" + contactToCheckAgainst.Mailing_Postal_Code__c + "'");