function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Fatima, Nadia & Khalid, Abdul Nasir', 1],
    ['Haqnawaz, Muhammad & Niazi, Abdul Rehman & Khalid, Abdul Nasir', 2],
    ['Hosen, Md. Iqbal & Song, Zong-ping & Gates, Genevieve', 2],
    ['Karunarathna, Samantha C. & Priyashantha, K Hasith', 3]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=8)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 4, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);