function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Casanova, J. - P. & Jong, L. De', 1],
    ['Forman, Jeffrey S. & Schnabel, Kareen E.', 3],
    ['Hendrickx, M. E. & Hernández-Payán, J. C.', 1],
    ['Hendrickx, Michel E. & Hernández-Payán, José-Carlos', 1],
    ['Vicente, Carlos San', 4],
    ['Vicente, Carlos San & Corbari, Laure', 2],
    ['Vicente, Carlos San & Frutos, Inmaculada & Cartes, Joan E.', 2],
    ['Wittmann, Karl J.', 4]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=18)',
    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);