
    Write a function that standardizes patient medical record identifiers by removing characters at odd positions, ensuring consistent formatting across hospital systems for accurate readmission risk analysis. The function should take a patient's medical record identifier string as input and return a new string containing only the characters at even indices (0-based indexing).
    

    
def odd_values_string(str):
    """
    Write a function that standardizes patient medical record identifiers by removing characters at odd positions, ensuring consistent formatting across hospital systems for accurate readmission risk analysis. The function should take a patient's medical record identifier string as input and return a new string containing only the characters at even indices (0-based indexing).
    

    """
def odd_values_string(str):
    """
    Write a function that standardizes patient medical record identifiers by removing characters at odd positions, ensuring consistent formatting across hospital systems for accurate readmission risk analysis. The function should take a patient's medical record identifier string as input and return a new string containing only the characters at even indices (0-based indexing).
    

    """
    result = ''
    for i in range(len(str)):
        if i % 2 == 0:
            result = result + str[i]
    return result