function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Arabyat, Sahar & Katbeh-Bader, Ahmad & Greathead, David', 7],
    ['Avalos-Hernandez, Omar & Kits, Joel & Trujano-Ortega, Marysol', 3],
    ['Bowden, John', 7],
    ['Dils, J. & Özbek, H.', 6],
    ['El-Hawagry, Magdi S. & Abdel-Dayem, Mahmoud S.', 11],
    ['El-Hawagry, Magdi S. & Al Dhafer, Hathal M.', 1],
    ['Greathead, D. J. & Evenhuis, N. L.', 1],
    ['Greathead, David J.', 6]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=42)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 8, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);