function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Andújar, Carmelo & Grebennikov, Vasily V. & Lencina, José Luís', 1],
    ['Andújar, Carmelo & Lencina, José Luís & Serrano, José', 1],
    ['Artur R. M. Serrano & Carlos A. S. Aguiar', 1],
    ['Ortuño, Vicente M. & Gilgado, José D.', 1],
    ['Pérez-González, Sergio & Zaballos, Juan P.', 6],
    ['Pérez-González, Sergio & Zaballos, Juan P. & Ghannem, Samir', 2],
    ['Serrano, Artur R. M. & Aguiar, Carlos A. S.', 3],
    ['Zaballos, Juan P. & Pérez-González, Sergio', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=16)',
    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);