function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Al-Handal, Adil Y. & Levkov, Zlatko & Wulff, Angela', 1],
    ['Beauger, Aude & Allain, Elisabeth & Voldoire, Olivier', 1],
    ['González-Paz, Lorena & Almeida, Salomé F. P. & Blanco, Saúl', 1],
    ['Levkov, Zlatko & Williams, David M.', 1],
    ['Li, Lang & Nong, Qun-Zhuan & Chen, Chang-Ping & Li, Yu-Hang', 4],
    ['Saber, Abdullah A. & Angeli, Nicola & Lange-Bertalot, Horst', 3]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=11)',
    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);