function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Arias, Erick & Chaves, Gerardo & Salazar, Stanley', 1],
    ['Batista, Abel & Kohler, Gunther & Mebert, Konrad', 4],
    ['Batista, Abel & Ponce, Marcos & Hertz, Andreas', 1],
    ['Chaves, Gerardo & García-Rodríguez, Adrián & Mora, Alejandra', 1],
    ['Hertz, Andreas & Hauenschild, Frank & Lotzkat, Sebastian', 1],
    ['Restrepo, Adriana & Molina-Zuluaga, Claudia & Hurtado, Juan P.', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=9)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 6, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);