function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Bamber, Roger N. & Marshall, David J.', 3],
    ['Błażewicz-Paszkowycz, Magdalena & Bamber, Roger N.', 4],
    ['Esquete, P. & Cunha, M. R.', 6],
    ['Kakui, Keiichi & Kajihara, Hiroshi', 1],
    ['Kakui, Keiichi & Kajihara, Hiroshi & Mawatari, Shunsuke F.', 5],
    ['Larsen, Kim', 2],
    ['Morales-Núñez, Andrés G. & Morales-Ruiz, Catalina', 1],
    ['Santos, Kátia Christol Dos', 7],
    ['Wi, Jin Hee & Kang, Chang-Keun', 2]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=31)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 9, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);