function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Durán-Ramírez, Carlos Alberto & Dias, Roberto Júnio Pedroso', 16],
    ['Durán-Ramírez, Carlos Alberto & Mayén-Estrada, Rosaura', 1],
    ['Foissner, Wilhelm & Wolf, Klaus W. & Kumar, Santosh', 5],
    ['Jang, Seok Won & Vďačný, Peter & Shazib, Shahed Uddin Ahmed', 5],
    ['Kwon, Choon Bong & Vďačný, Peter & Shazib, Shahed Uddin Ahmed', 1],
    ['Rajter, Ľubomír & Bourland, William & Vďačný, Peter', 2],
    ['Smith, Gideon F.', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=31)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 7, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);